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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss) | 21. Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss) by component were as follows (in millions):
|  | Employee Pension and Postretirement Benefits, Net of Tax |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments, Net of Tax |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at September 30, 2020 |  | $ | (95.9 | ) |  | $ | (102.1 | ) |  | $ | (0.4 | ) |  | $ | (198.4 | )
Other comprehensive income (loss) before reclassifications |  |  | 57.1 |  |  |  | 3.8 |  |  |  | 1.5 |  |  |  | 62.4 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 4.6 |  |  |  | — |  |  |  | 0.4 |  |  |  | 5.0 |
Net current period other comprehensive income (loss) |  |  | 61.7 |  |  |  | 3.8 |  |  |  | 1.9 |  |  |  | 67.4 |
Balance at September 30, 2021 |  |  | (34.2 | ) |  |  | (98.3 | ) |  |  | 1.5 |  |  |  | (131.0 | )
Other comprehensive income (loss) before reclassifications |  |  | 8.2 |  |  |  | (6.9 | ) |  |  | 0.9 |  |  |  | 2.2 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.4 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 0.2 |
Net current period other comprehensive income (loss) |  |  | 8.6 |  |  |  | (6.9 | ) |  |  | 0.7 |  |  |  | 2.4 |
Balance at December 31, 2021 |  |  | (25.6 | ) |  |  | (105.2 | ) |  |  | 2.2 |  |  |  | (128.6 | )
Other comprehensive income (loss) before reclassifications |  |  | 29.3 |  |  |  | (31.0 | ) |  |  | 6.2 |  |  |  | 4.5 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 27.4 |  |  |  | 4.6 |  |  |  | (0.2 | ) |  |  | 31.8 |
Net current period other comprehensive income (loss) |  |  | 56.7 |  |  |  | (26.4 | ) |  |  | 6.0 |  |  |  | 36.3 |
Balance at December 31, 2022 |  |  | 31.1 |  |  |  | (131.6 | ) |  |  | 8.2 |  |  |  | (92.3 | )
Other comprehensive income (loss) before reclassifications |  |  | 3.5 |  |  |  | 24.2 |  |  |  | (0.5 | ) |  |  | 27.2 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (1.6 | ) |  |  | 2.9 |  |  |  | (8.2 | ) |  |  | (6.9 | )
Net current period other comprehensive income (loss) |  |  | 1.9 |  |  |  | 27.1 |  |  |  | (8.7 | ) |  |  | 20.3 |
Balance at December 31, 2023 |  | $ | 33.0 |  |  | $ | (104.5 | ) |  | $ | (0.5 | ) |  | $ | (72.0 | )
Reclassifications out of accumulated other comprehensive income (loss) included in the computation of net periodic pension and postretirement benefit cost (See Note 6 for additional details regarding employee benefit plans) were as follows (in millions):
|  | Classification of |  | Year Ended December 31, |  |  | (transition period) Three Months Ended December 31, |  |  | Year Ended September 30, |
|  | income (expense) |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2021 |
Amortization of employee pension and postretirement benefits items |
Prior service costs |  | Miscellaneous, net |  | $ | 0.5 |  |  | $ | 0.8 |  |  | $ | 0.2 |  |  | $ | 0.9 |
Settlement |  | Miscellaneous, net |  |  | — |  |  |  | 33.6 |  |  |  | — |  |  |  | — |
Actuarial (gains) losses |  | Miscellaneous, net |  |  | (2.6 | ) |  |  | 1.3 |  |  |  | 0.3 |  |  |  | 5.2 |
Total before tax |  |  |  |  | (2.1 | ) |  |  | 35.7 |  |  |  | 0.5 |  |  |  | 6.1 |
Tax benefit |  |  |  |  | 0.5 |  |  |  | (8.3 | ) |  |  | (0.1 | ) |  |  | (1.5 | )
Net of tax |  |  |  | $ | (1.6 | ) |  | $ | 27.4 |  |  | $ | 0.4 |  |  | $ | 4.6 |

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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//1943274/2147483586/944-220-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//1943274/2147483589/942-220-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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