Christa Davies
Executive Vice President, Global Finance and Chief Financial Officer at AON
Thank you so much, Greg, and thank you so much for the partnership. My time at Aon was and will continue to be the highlight of my career. I remain incredibly excited about the value creation potential we have ahead of us through the 3x3 plan. I'm thrilled to welcome Edmund, and I look forward to serving as an advisor to the team to support and ensure a smooth transition.
Turning now to the quarter. As Greg highlighted, we delivered exceptional results in the second quarter, with 6% organic revenue growth highlighted by 7% in Wealth and 7% in -- sorry, 9% in Wealth and 7% in Reinsurance. Our overall organic revenue growth does not include the impact -- does include the impact of NFP, beginning from April '25 when we closed the acquisition. Though we only had two months performance, NFP's Q2 performance was in line with the business case as it delivered mid-single-digit organic revenue growth. NFP also contributed to the 18% total revenue growth in the quarter, which translated into a 19% adjusted operating income growth, margins of 27.4% and 6% adjusted per share -- earnings per share growth. These results position us well to drive progress against all elements of the 3x3 plan, driving results in 2024 and over the long term.
As I reflect on our performance for the first half of the year, as Greg noted, organic revenue growth was 6% in Q2, driven by net new business generation and ongoing strong retention. We continue to expect mid-single-digit or greater organic revenue growth for the full year 2024 and over the long term.
As Greg described, we're making excellent progress with NFP. We continue to expect that NFP will contribute to the firm's overall revenue growth through organic revenue growth, including $175 million of net revenue synergies by 2026 and inorganic growth from ongoing M&A. While it's early, we're on track to achieve deal synergies, with no net impact in 2024 from cost and revenue synergies and positive impact in 2025 and 2026. This is exactly in line with the guidance we gave when we announced the deal. It's also worth noting that voluntary colleague attrition at NFP is down year-over-year.
Moving to operating performance. We delivered strong operational improvement with adjusted operating margins of 33.8% in the first half, an increase of 20 basis points, driven by revenue growth, portfolio mix shift, efficiencies from Aon Business Services and restructuring savings, overcoming expense growth, including investments in colleagues and technology to drive long-term growth.
If we consider the combined historic margin profile of Aon and NFP, including two-thirds of NFP's results from the second quarter of 2023, adjusted operating margins expanded 60 basis points in Q2 and 80 basis points year-to-date, which is how we think about ongoing margin expansion. We're making meaningful progress on our Aon Business Services strategy, including through our restructuring program, which helps to accelerate our 3x3 plan and contributes to margin expansion through net savings.
We continue to streamline and improve operational processes, moving work to the best locations and enhancing colleague and client experience with powerful new tools such as our property, casualty, D&O, cyber and health risk analyzers.
Restructuring savings in the second quarter were $25 million, resulting in $45 million of restructuring savings year-to-date and 60 basis points of contribution to adjusted operating margin year-to-date. Restructuring actions completed so far are expected to generate $95 million of savings in 2024. We expect restructuring savings will fall to the bottom line. At this time, we continue to expect $100 million of realized savings in 2024 as we continue to accelerate our plans for Aon Business Services and our business.
As we think about adjusted operating margins moving forward, we continue to expect to drive adjusted operating margin expansion over the full year on a combined firm basis and the long term through ongoing revenue growth, portfolio mix shift to higher revenue growth, higher margin areas of the portfolio, and efficiencies from Aon Business Services. As we previously communicated, we think the right baseline from which to measure 2025 adjusted operating margin growth is 30.6%. Calculated out as 31.6% from 2023, less 100 basis point drag from NFP for the period from the 2020 -- from the April '25 close through the end of 2024.
We also expect fiduciary investment income to be relatively flat year-over-year based on current interest rate expectations. So we expect the tailwind we've seen in the first half of the year will be reduced in the back half, though we remain committed to driving full year adjusted operating margin expansion in 2024 and over the long term against this adjusted baseline of 30.6%.
Turning to EPS. Adjusted EPS grew 6% in Q2 and 7% year-to-date, reflecting double-digit adjusted operating income growth and ongoing share buyback, partially offset by higher interest expense, the issuance of 19 million shares to fund the acquisition of NFP and a higher tax rate.
Turning now to free cash flow. We generated $721 million of free cash flow year-to-date, reflecting strong operating income growth and lower CapEx, offset by payments related to NFP transaction and integration charges, legal settlement expense, restructuring and higher cash tax payments, as we've previously communicated. As we look forward, our free cash flow outlook remains strong based on our strong expected operating income growth and a $500 million long-term opportunity in working capital. We've communicated that, in the near term, free cash flow will be impacted by restructuring, higher interest expense and NFP deal and integration costs. In 2025 and 2026, NFP is expected to add $300 million and $600 million of incremental free cash flow, respectively, contributing to our overall expectation of long-term double-digit free cash flow growth.
We allocate capital based on ROIC and long-term value creation, which we've done through time through core business investment, share buyback and M&A. As we look historically, we have a successful track record of balancing organic investment, acquisitions, divestitures and share buyback as we continue to optimize our portfolio against our priority investment areas on an ROIC basis.
Given the very strong long-term free cash flow outlook for the firm, we expect share repurchase will remain our highest ROIC opportunity. We completed $500 million of buyback in the first half and continue to expect share buyback to be substantial at $1 billion or more in 2024 based on our current M&A expectations for the rest of the year. We also expect to continue to invest organically and inorganically in content and capabilities that we can scale to address unmet client needs.
Regarding M&A. Our M&A pipeline continues to be focused on our high priority areas, including the mid-market and attractive geographies that will bring scalable solutions to our clients' growing and evolving challenges, known that we closed an acquisition in France this quarter, bringing new specialist capabilities and health and benefits into Aon. We are also continuing to see success from NFP's impressive M&A engine. Since the beginning of 2024, NFP has completed 14 acquisitions at attractive multiples weighted towards commercial risk and health, representing $36 million in annualized revenue.
As we previously communicated, we expect NFP to do M&A comprised of $45 million to $60 million of EBITDA per year, and they are on track for the full year 2024. We look forward to building on their established track record and executing against this strong pipeline to drive future growth in the space and value creation within our ROIC framework.
Going forward, we'll continue to actively manage the portfolio and assess all capital allocation decisions on an ROIC basis, contemplating buyback, M&A and delevering.
Turning now to our balance sheet and debt capacity. We remain confident in the strength of our balance sheet. As previously communicated, we expect our credit ratios to be elevated over the next 12 to 18 months, as we bring our leverage ratios back in line with levels consistent with our credit profile, driven by substantial free cash flow generation and incremental debt capacity from EBITDA growth, noting our track record of effectively managing leverage within our current ratings.
In summary, our strong financial results in the quarter and year-to-date position us well to continue driving progress against all elements of our 3x3 plan and driving results in 2024 and over the long term. We look forward to building on this momentum.
With that, I'll turn the call back over to the operator, and Greg, Eric and I'd be delighted to take your questions.