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Accumulated Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss) | 18. Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss) b y component, net of tax, were as follows (in millions):
|  | Three Months Ended September 30, 2025 |
|  | Pension and Post-Employment Benefits |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at beginning of period |  | $ | 66.3 |  |  | $ | (59.1 | ) |  | $ | 0.2 |  |  | $ | 7.4 |
Other comprehensive income (loss) before reclassifications |  |  | — |  |  |  | (3.1 | ) |  |  | (0.3 | ) |  |  | (3.4 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (1.1 | ) |  |  | — |  |  |  | — |  |  |  | (1.1 | )
Net other comprehensive income (loss) |  |  | (1.1 | ) |  |  | (3.1 | ) |  |  | (0.3 | ) |  |  | (4.5 | )
Balance at end of period |  | $ | 65.2 |  |  | $ | (62.2 | ) |  | $ | (0.1 | ) |  | $ | 2.9 |
|  | Three Months Ended September 30, 2024 |
|  | Pension and Post-Employment Benefits |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at beginning of period |  | $ | 32.1 |  |  | $ | (133.4 | ) |  | $ | (0.4 | ) |  | $ | (101.7 | )
Other comprehensive income (loss) before reclassifications |  |  | — |  |  |  | 29.9 |  |  |  | — |  |  |  | 29.9 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (0.4 | ) |  |  | — |  |  |  | (0.1 | ) |  |  | (0.5 | )
Net other comprehensive income (loss) |  |  | (0.4 | ) |  |  | 29.9 |  |  |  | (0.1 | ) |  |  | 29.4 |
Balance at end of period |  | $ | 31.7 |  |  | $ | (103.5 | ) |  | $ | (0.5 | ) |  | $ | (72.3 | )
|  | Nine Months Ended September 30, 2025 |
|  | Pension and Post-employment Benefits |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at beginning of period |  | $ | 68.4 |  |  | $ | (172.2 | ) |  | $ | 0.6 |  |  | $ | (103.2 | )
Other comprehensive income (loss) before reclassifications |  |  | — |  |  |  | 110.0 |  |  |  | (0.1 | ) |  |  | 109.9 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (3.2 | ) |  |  | — |  |  |  | (0.6 | ) |  |  | (3.8 | )
Net other comprehensive income (loss) |  |  | (3.2 | ) |  |  | 110.0 |  |  |  | (0.7 | ) |  |  | 106.1 |
Balance at end of period |  | $ | 65.2 |  |  | $ | (62.2 | ) |  | $ | (0.1 | ) |  | $ | 2.9 |
|  | Nine Months Ended September 30, 2024 |
|  | Pension and Post-employment Benefits |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at beginning of period |  | $ | 33.0 |  |  | $ | (104.5 | ) |  | $ | (0.5 | ) |  | $ | (72.0 | )
Other comprehensive income (loss) before reclassifications |  |  | — |  |  |  | 1.0 |  |  |  | 0.5 |  |  |  | 1.5 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (1.3 | ) |  |  | — |  |  |  | (0.5 | ) |  |  | (1.8 | )
Net other comprehensive income (loss) |  |  | (1.3 | ) |  |  | 1.0 |  |  |  | — |  |  |  | (0.3 | )
Balance at end of period |  | $ | 31.7 |  |  | $ | (103.5 | ) |  | $ | (0.5 | ) |  | $ | (72.3 | )

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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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