Edmund Reese
Executive Vice President and Chief Financial Officer at AON
Thank you, Greg, and good morning, everyone. I joined Aon a little over three months ago and I couldn't be more excited to be a part of this company given the opportunities ahead of us. My confidence in the financial model, delivering organic revenue growth, margin expansion and double-digit free cash flow over the long-term has only increased. In the immediate term, I'm pleased to be here delivering the third quarter results. And before jumping into the detail, let me elevate what matters most.
First, after a strong Q3, we're right on track to deliver a full-year 2024, in-line with our objectives and guidance, including mid single-digit or greater organic revenue growth, adjusted margin expansion and free cash flow generation that allows us to delever, while simultaneously returning $1 billion in capital to shareholders through share repurchases.
Second, our organic revenue growth reached 7% in the third quarter. Importantly, this performance was strong across the enterprise with organic revenue growth of 6% or higher in each of our solution lines. This is a direct result of executing our 3x3 plan, and the investments that we're making to drive top-line growth, beginning with our investment in hiring client-facing talent in specialty areas, expanding our client group to now nearly 450 clients, and further expanding our integrated risk data predictive analyzers across property, casualty, D&O, cyber and health.
And finally, the investment thesis on NFP remains, as we're off to a strong start with NFP performing in-line or better than the metrics that we measure in the business case. With five months results since the acquisition, NFP's year-to-date organic revenue growth is strong. Retention is better than last year-on top of a solid recruiting pipeline, and the M&A middle market growth engine is humming, having acquired $26 million in EBITDA year-to-date. These acquired firms are seeing value in our independent and connected model, connected to Aon content and capabilities, while maintaining an independent distribution and service model. Overall, we have momentum and our continued execution of the 3x3 strategy and creating investment capacity and margin expansion by delivering on our restructuring saves gives me a high level of confidence in delivering on our near and long-term financial objectives, including a double-digit three-year CAGR and free cash flow from 2023 to 2026.
I'll add one logistical note before turning to the results. You'll notice that we took the opportunity to add content with the intention of providing additional transparency and clarity into our performance and expectations and to help you better understand the connection between our strategy and performance. You can expect that we'll have minor adjustments to refine our material over the next few calls to support greater engagement with our investors and our analysts.
So now turning to the third quarter results and the financial summary on Slide 6. You see that we delivered 7% organic revenue growth in the third quarter. Adjusted operating margin was 24.6%, up 30 basis points. And I'll remind you that we look at our margin expansion relative to a 2023 baseline that includes NFP. And when doing so, operating margin expanded 70 basis points in the quarter. Adjusted EPS was up 17% to $2.72 and finally, we generated $951 million in free cash flow, bringing our total through three quarters to $1.7 billion.
Let's get into the details of these results, starting with organic revenue growth on Slide 8. Organic revenue growth of 7% in Q3 '24 was at the high-end of our mid single-digit or greater guidance range. Growth in commercial risk was again strong at 6% with all other solution lines growing at or above 7%. In commercial risk, organic revenue growth was 6% in Q3 and reflected strength in our North American core P&C business, driven by net new business and strong retention, as well as double-digit growth in M&A services and continued strong performance in EMEA. Reinsurance with 7% organic revenue growth in Q3, was led by a balanced contribution to growth from our treaty and facultative placements. It's worth noting that our outlook on the seasonally smaller fourth quarter is for low single-digit growth given lower Fac revenue and the impact of growing over an elevated Q4 '23. We expect full-year organic growth to achieve our mid-single or greater growth objective.
Health Solutions delivered 9% organic revenue growth with double-digit growth in our international markets from new business and core, health and benefits, and data analytics-driven sales in our talent business. The market demand environment continues to reflect increased health cost trends and positive impacts from enrollment levels. I'll also mention that in the fourth quarter, we'll be growing over an elevated Q4 '23. And finally, Wealth Solutions organic revenue growth was 7%, driven by continued strong demand for pension risk transfer and regulatory changes across the UK and EMEA, and a positive contribution from NFP.
And let me also provide some additional color on NFP. NFP was accretive to commercial risk and wealth solutions and delivered mid-single-digit growth in health. NFP and Aon are both producing mid single-digit organic revenue growth, and NFP is performing in-line with our business case. Overall, organic revenue growth continues to be driven by net-new business and strong retention. And I'll provide a little color on how net-new business growth and market impact helped us deliver our 7% organic revenue growth.
As you think about the 7%, recurring new business from new logos and existing clients contributed 10 points to growth. And with continued high retention, net-new business contributed 5 points to organic growth. The net market impact from growth in exposures and rate was 2 points. We saw flat rate impacts in reinsurance with limited increases in rate benefit across commercial, health and wealth. I'll also pause here and note that we continue to make great progress on our priority talent acquisition, with continuing focus on hiring specialty talent in construction, energy and health as well as in our enterprise client group. We expect these new colleagues to season and contribute to organic growth within 12 to 18 months, which contributes to our mid-single digit or better organic growth objective.
And one final point on revenue. Third quarter fiduciary investment income was up 6% over last year to $85 million. And as a reminder, we do not include fiduciary investment income in our organic revenue growth calculation. Of course, as interest rates decline, we expect an impact on income from fiduciary balances, which averaged $7.3 billion over the trailing 12 months.
For modeling purposes, I'll remind you that a 100 basis point impact on rates has a full-year impact of approximately $70 million on investment income. As interest rates decline, lower investment income does lower our margins. However, we still expect to drive adjusted operating margin expansion. Additionally, I'll point out that the earnings impact is partially offset by lower interest expense on our term-loan debt. The strength of our business model and our outlook for top and bottom line growth underpins our expectations that we will deliver double-digit free cash flow growth, irrespective of interest rate movements.
On Slide 10, operating income was up 28% to $915 million. Adjusted operating margins were 24.6% in the third quarter and 30.8% year-to-date. For the quarter, margins were up 30 basis points. From our combined baseline with NFP, margins expanded 70 basis points in the quarter and year-to-date. Adjusted operating margin continued to benefit from the scale in our business, particularly in Aon business services, or ABS, our continued portfolio management and shift to higher margin businesses, as well as ongoing expense discipline and importantly, the benefit from our restructuring initiative to accelerate our 3x3 plan. Specifically, restructuring savings in the third quarter were $25 million, resulting in $70 million year-to-date savings and 70 basis points of contribution to adjusted operating margins.
Looking ahead, we continue to expect $100 million of savings in 2024 and are well on-track to achieve our stated goal of $350 million of run rate savings in 2026. Additionally, the momentum in ABS gives us confidence in continued margin expansion over the long-term as we standardize our operations and integrate our platforms. We remain committed to driving full-year adjusted operating margin expansion in 2024 and over the long-term from the NFP adjusted 2023 baseline of 30.6% [Phonetic]
Moving to interest, other income and taxes on Slide 11. Interest expense of $213 million was up $94 million versus last year, reflecting $7 billion in higher debt, driven by the NFP acquisition, we expect $210 million of interest expense in Q4. Other income was $54 million higher year-over-year as we divested non-core personal lines and real-estate advisory assets. The result of our continued focus on portfolio management is a higher growth and higher-margin portfolio. And finally, the Q3 tax rate was 18%, with year-over-year increase driven by growth in higher tax geographies, the unfavorable impact of discrete items and policy changes across the globe. As we look forward, we expect to provide further color on 2025 tax rates during our year-end earnings call.
Turning now to free cash flow. We generated $1.7 billion of free cash flow year-to-date, reflecting strong operating income growth and continued working capital improvements. Our free cash flow is being impacted by extraordinary items, including NFP transaction and integration charges, restructuring and legal settle -- and legal settlement expenses we previously communicated. We have line-of-sight on these items and remain confident in underlying free cash flow growth.
We continue to expect a double-digit three-year CAGR on free cash flow from 2023 to 2026. And given our expectations on free cash flow, we are well-positioned to pay down $2.1 billion in debt in 2024. As we look-forward, we continue to have confidence in our ability to reduce our debt-to-EBITDA leverage ratio from 3.9 to 2.8 to 3 times in Q4 2025. I'll also highlight that through the first-nine months of the year, we have returned $1.2 billion in capital to shareholders due to dividend and $800 million in share repurchases. We continue to estimate approximately $1 billion in share repurchases for 2024.
I'll end my prepared remarks on Slide 13 with guidance and some concluding thoughts. With 7% organic growth and continued margin expansion, the third quarter reflects continued momentum in our business. We are executing on our 3x3 plan, and are pleased to see that execution come through in our results. We are reaffirming our full-year guidance for 2024, including mid single-digit or greater organic revenue growth, adjusted operating margin expansion above our 2023 30.6% baseline, $100 million of savings in 2024 from our restructuring initiative, all contributing to double-digit free cash flow growth over '23 to '26.
Additionally, the investments that we're making to higher and priority areas highlights the strength of our financial model and our ability to balance sustainable organic growth with growth investments while driving margin expansion and generating double-digit free cash flow growth over the long-term. This financial model gives us confidence in meeting our '24 to 2026 objectives, and in driving sustainable long-term growth. My prepared remarks gives you a sense of why I'm excited to be the CFO of Aon. Working with my 60,000 colleagues to build on Aon's long track record of performance. We have a clear strategy for growth. We are executing on that strategy in making the investments in ABS and middle-market priority hires to sustain that growth on both the top and the bottom line. And as you can see in our 2024 third quarter and year-to-date results, that execution is driving strong performance.
So, with that, lets jump into your questions. Melissa, I'll turn it back to you.