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Accumulated Other Comprehensive Loss ("AOCL") | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Loss ("AOCL") | 6. Accumulated Other Comprehensive Loss ("AOCL")
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) |
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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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