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Accumulated Other Comprehensive Loss ("AOCL") (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of accumulated balances for each component of AOCI |
Components of AOCL: |  | September 30, 2025 |  | December 31, 2024
Defined benefit plan liabilities |  | $ | (102.1) |  |  | $ | (107.0) |
Unrealized gain on financial instruments |  | 1.2 |  |  | 1.4 |
Other comprehensive loss before income tax effect |  | (100.9) |  |  | (105.6) |
Income tax effect(1) |  | 2.3 |  |  | 2.3 |
Accumulated other comprehensive loss |  | $ | (98.6) |  |  | $ | (103.3) |
(1)The allocation of the income tax effect to the components of other comprehensive loss is as follows:
|  | September 30, 2025 |  | December 31, 2024
Defined benefit plan liabilities |  | $ | 2.6 |  |  | $ | 2.6 |
Unrealized gain on financial instruments |  | (0.3) |  |  | (0.3) |
The following table summarizes the changes in the accumulated balances for each component of AOCL:
| Defined benefit plan and other postretirement liabilities |  | Unrealized gain on financial instruments |  | Total, net of tax
Balance, June 30, 2025 | $ | (101.3) |  |  | $ | 1.2 |  |  | $ | (100.1) |
Net amount reclassified to net income (loss) | 1.5 |  |  | — |  |  | 1.5 |
Balance, September 30, 2025 | $ | (99.8) |  |  | $ | 1.2 |  |  | $ | (98.6) |
Balance, June 30, 2024 | $ | (99.5) |  |  | $ | 1.4 |  |  | $ | (98.1) |
Net amount reclassified to net income (loss) | 1.7 |  |  | — |  |  | 1.7 |
Balance, September 30, 2024 | $ | (97.8) |  |  | $ | 1.4 |  |  | $ | (96.4) |
Balance, December 31, 2024 | $ | (104.6) |  |  | $ | 1.3 |  |  | $ | (103.3) |
Net amount reclassified to net income (loss) | 4.8 |  |  | (0.1) |  |  | 4.7 |
Balance, September 30, 2025 | $ | (99.8) |  |  | $ | 1.2 |  |  | $ | (98.6) |
Balance, December 31, 2023 | $ | (99.4) |  |  | $ | 1.5 |  |  | $ | (97.9) |
Other comprehensive loss before reclassifications | (3.4) |  |  | — |  |  | (3.4) |
Net amount reclassified to net income (loss) | 5.0 |  |  | (0.1) |  |  | 4.9 |
Balance, September 30, 2024 | $ | (97.8) |  |  | $ | 1.4 |  |  | $ | (96.4) |
Schedule of reclassification out of AOCI | Reclassifications out of AOCL were included in the Consolidated Statements of Operations as follows:
|  |  |  | Three months ended September 30, |  | Nine months ended September 30,
AOCL Components |  | Location |  | 2025 |  | 2024 |  | 2025 |  | 2024
Defined benefit plan and other postretirement liabilities |  | Cost of goods sold |  | $ | 0.6 |  |  | $ | 0.7 |  |  | $ | 2.2 |  |  | $ | 2.3 |
|  | Selling, general and administrative expenses |  | 0.1 |  |  | 0.2 |  |  | 0.4 |  |  | 0.5 |
|  | Other operating expense - net |  | 0.8 |  |  | 0.8 |  |  | 2.2 |  |  | 2.2 |
|  | Income tax effect |  | — |  |  | — |  |  | — |  |  | — |
|  | Net of tax |  | $ | 1.5 |  |  | $ | 1.7 |  |  | $ | 4.8 |  |  | $ | 5.0 |
Unrealized gain on financial instruments |  | Cost of goods sold |  | $ | — |  |  | $ | — |  |  | $ | (0.1) |  |  | $ | (0.1) |
|  | Income tax effect |  | — |  |  | — |  |  | — |  |  | — |
|  | Net of tax |  | $ | — |  |  | $ | — |  |  | $ | (0.1) |  |  | $ | (0.1) |

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