Tim S. Nicholls
Senior Vice President and Chief Financial Officer at International Paper
Thank you, Mark. Turning to our third quarter key financials on Slide four. Our earnings per share increased sequentially and came in better than the outlook we provided last quarter. We continue to optimize our system through commercial and operational initiatives, and we also benefited from lower employee benefit cost and a lower effective tax rate. Operating margins continue to be under pressure from macroeconomic headwinds, impacting sales price and volumes. However, margins improved quarter-over-quarter, driven by more favorable operating costs and lower outage expenses. Moving to the third quarter sequential earnings bridge on Slide five.
Third quarter operating earnings per share was $0.64 as compared to $0.59 in the second quarter. Price and mix was lower by $0.35 per share, primarily due to index movements across our portfolio and lower export sales prices. Volume was relatively stable overall as higher volumes across our containerboard export panel and global sales fibers business offset one less shipping day in our North American packaging business. Operations and costs improved earnings by $139 million or $0.30 per share. During the quarter, our mill system ran very well, and our teams across the businesses continued their focus on reducing marginal cost and spending.
We're accomplishing this by optimizing mix and usage of fiber and energy, reducing labor costs and over time, shifting to lower cost suppliers and driving lower distribution costs. During the third quarter, we also had lower employee benefit costs totaling about $80 million or $0.18 per share, which was in our outlook provided last quarter and will not repeat in the fourth quarter. The balance is primarily due to lower unabsorbed fixed costs related to last economic downtime across our portfolio as demand improved. Maintenance outages were lower by $36 million or $0.08 per share in the third quarter. Input costs were modestly higher as increased cost for energy and OCC were partially offset by lower cost for chemicals and wood, and corporate items benefited from a lower effective tax rate in the third quarter.
Turning to the segments and starting with Industrial Packaging on Slide six. Price and mix was lower due to index movements, lower export prices and higher export mix as demand improved. This was partially offset by benefits from commercial initiatives focused on margin improvement. Volume was stable overall despite one less shipping day in box. Containerboard shipments were higher across our export channels due to improved demand. And our daily U.S. box shipments were stable to slightly higher sequentially.
Demand for packaging was also impacted by customer inventory destocking. However, based on customer feedback, we believe this is generally completed at the end of the third quarter. Operations and costs improved earnings by $103 million. This includes the benefit of $68 million from the nonrepeat items I mentioned earlier. In addition, ops and costs also benefited from lower economic downtime in the quarter as demand improved. Our mill system continued to run very reliably and our teams across the businesses remain focused on reducing the highest marginal cost and spending while further optimizing our entire supply chain to align with the customer demand environment.
For example, by optimizing fiber, energy mix and raw materials, we have reduced the cost of economic downtime by approximately $20 million on an annualized basis. We also have significant efforts underway to improve distribution costs, including initiatives to minimize high-cost freight carriers, improve contract rates and load efficiencies and shed warehouse and demerge expenses. These efforts have lowered our supply chain costs by approximately $40 million on an annualized basis. And there's more opportunities in this area as we go forward.
Planned maintenance outages were lower by $34 million sequentially due to a seasonally lower outage schedule and our efforts to further reduce outage spending in the current demand environment. Input costs were moderately higher, primarily due to the higher costs for energy and OCC, partly offset by lower costs for chemicals. Turning to Global Cellulose Fibers on Slide seven. And looking at our third quarter performance, price and mix was lower due to price index moves, partially offset by the benefits from higher fluff mix. Volume was higher in the third quarter as demand for fluff improved.
This was partially offset by lower sales of commodity grades as we continue to focus on strategically aligning our business with the most attractive customers and segments. The destocking trend continued in the third quarter as improvement across supply chains allow customers to manage more lean inventory levels. Based on feedback from our customers and from order bookings, we believe destocking was largely completed in the third quarter. We also believe fluff demand will continue to grow over time because of the essential role that absorbent personal care products play in meeting consumer needs.
Operations and costs improved earnings by $36 million. This includes a benefit of $12 million from the nonrepeat items I mentioned earlier. Ops and costs also benefited from strong operational performance, lower supply chain costs, lower spending and higher energy sales as our teams remain focused on optimizing the entire value chain. Planned maintenance outages were relatively flat sequentially and input costs were lower by $5 million, primarily due to lower wood and chemical costs. Turning to Slide eight and our fourth quarter outlook. I'll start with Industrial Packaging. We expect price and mix to decrease earnings by $60 million as a result of prior index movement in North America and lower average export prices based on declines to date.
Volume is expected to increase earnings by $20 million due to sequentially higher box volumes despite one less shipping day and an increase in containerboard export shipments. Operations and costs are expected to decrease earnings by $10 million. This is due to the nonrepeat of favorable employee benefit costs I mentioned earlier, partially offset by lower unabsorbed fixed related to higher volumes and benefits from our ongoing cost management initiatives. Lower maintenance outage expense is expected to increase earnings by $21 million. And lastly, rising input costs are expected to decrease earnings by $10 million driven by higher OCC costs, partially offset by lower cost for energy, wood and other raw materials. Turning to Global Cellulose Fibers.
We expect price and mix to decrease earnings by $25 million as a result of prior index movements. Overall, volume is expected to increase earnings by $5 million. We expect higher fluff volumes due to improving demand, offset by lower -- of commodity grades as we execute our mix optimization strategy. Operations and costs are expected to decrease earnings by $35 million relative to the third quarter. Approximately half of this is due to the nonrepeat of favorable employee benefit costs I discussed earlier. The remainder due to higher planned maintenance outage costs in the fourth quarter. Higher maintenance outage expense is expected to decrease earnings by $28 million. Lastly, lower input costs are expected to increase earnings by $5 million. And with that, I'll turn it back over to Mark.