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v3.25.3

Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 776.0 |  | $ 756.8 | $ 743.1 | [1],[2] | $ 727.6 | [3] | $ 714.7 | [3] | $ 652.2 | [3] | $ 743.1 | [1],[2] | $ 652.2 | [3]
Other comprehensive (loss) income, net of tax |  | (0.5) |  | 4.1 | 2.6 |  | 2.1 | [4] | 3.2 | [3] | (2.1) | [3] | 6.2 |  | 3.2 | [4]
Ending balance |  | 806.1 |  | 776.0 | 756.8 |  | 729.4 | [3] | 727.6 | [3] | 714.7 | [3] | 806.1 |  | 729.4 | [3]
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 19.6 |  |  | 19.1 |  | 10.4 |  |  |  | 11.0 |  | 19.1 |  | 11.0 |
Less: income tax benefit (expense) | [5] | (0.1) |  |  |  |  | (0.2) |  |  |  |  |  | (0.3) |  | (0.2) |
Net (gain) loss reclassified from AOCI to Net income |  | 0.2 |  |  |  |  | 0.5 |  |  |  |  |  | 0.8 |  | 0.5 |
Other comprehensive (loss) income, net of tax |  | 0.2 |  |  |  |  | 0.5 |  |  |  |  |  | 0.7 |  | (0.1) |
Ending balance |  | 19.8 |  | 19.6 |  |  | 10.9 |  | 10.4 |  |  |  | 19.8 |  | 10.9 |
Defined Benefit Plans: Net Actuarial (Loss) Gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  | (0.1) |  | 1.4 |
Less: income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.3) |
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  |  |  |  |  |  |  |  |  |  |  |  | (0.1) |  | 1.1 |
Reclassification from AOCI | [6] | (0.7) |  |  |  |  | (0.3) |  |  |  |  |  | (1.8) |  | (0.8) |
Defined Benefit Plans: Net Prior Service Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2.2) |
Less: income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 |
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.7) |
Reclassification from AOCI | [6] | 1.0 |  |  |  |  | 1.0 |  |  |  |  |  | 2.9 |  | 1.5 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 7.6 |  |  | 1.4 |  | 3.8 |  |  |  | 2.1 |  | 1.4 |  | 2.1 |
Unrealized gain on cash flow hedges |  | 9.0 |  |  |  |  | 0.6 |  |  |  |  |  | 25.2 |  | 2.5 |
Less: income tax expense |  | (2.1) |  |  |  |  | (0.2) |  |  |  |  |  | (5.9) |  | (0.6) |
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | 6.9 |  |  |  |  | 0.4 |  |  |  |  |  | 19.3 |  | 1.9 |
Reclassification from AOCI |  | (10.0) |  |  |  |  | 1.5 |  |  |  |  |  | (18.0) |  | 1.6 |
Reclassification due to forecasted transactions probable of not occurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2 |
Less: income tax benefit (expense) |  | 2.4 |  |  |  |  | (0.3) |  |  |  |  |  | 4.2 |  | (0.4) |
Net (gain) loss reclassified from AOCI to Net income |  | (7.6) |  |  |  |  | 1.2 |  |  |  |  |  | (13.8) |  | 1.4 |
Other comprehensive (loss) income, net of tax |  | (0.7) |  |  |  |  | 1.6 |  |  |  |  |  | 5.5 |  | 3.3 |
Ending balance |  | 6.9 | [7] | 7.6 |  |  | 5.4 | [7] | 3.8 |  |  |  | 6.9 | [7] | 5.4 | [7]
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 27.2 |  | 23.1 | 20.5 | [1] | 14.2 | [3] | 11.0 | [3] | 13.1 |  | 20.5 | [1] | 13.1 |
Other comprehensive (loss) income, net of tax |  | (0.5) |  | 4.1 | 2.6 |  | 2.1 |  | 3.2 |  | (2.1) |  |  |  |  |
Ending balance |  | $ 26.7 |  | $ 27.2 | $ 23.1 |  | $ 16.3 |  | $ 14.2 | [3] | $ 11.0 | [3] | $ 26.7 |  | $ 16.3 |
[1] | Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[2] | Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[3] | Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[4] | Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[5] | Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.
[6] | Amounts amortized out of AOCI related to pension and other postretirement and postemployment benefits were included within Net periodic postretirement and postemployment benefit cost (see Note 3).
[7] | As of September 30, 2025, we estimate a net mark-to-market gain before tax of $8.7 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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