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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component | 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, 2019 |  | $ | (69.4 | ) |  | $ | (132.5 | ) |  | $ | 0.3 |  |  | $ | (201.6 | )
Other comprehensive income (loss) before reclassifications |  |  | (29.3 | ) |  |  | 30.4 |  |  |  | (0.5 | ) |  |  | 0.6 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 2.8 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 2.6 |
Net current period other comprehensive income (loss) |  |  | (26.5 | ) |  |  | 30.4 |  |  |  | (0.7 | ) |  |  | 3.2 |
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 | )
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Included in the Computation of Net Periodic Pension and Postretirement Benefit Cost | Reclassifications out of accumulated other comprehensive income (loss) included in the computation of net periodic pension and postretirement benefit cost (See Note 5 of the Notes to Consolidated Financial Statements for additional details regarding employee benefit plans) were as follows (in millions):
|  | Classification of |  | Year Ended December 31, |  |  | Three Months Ended December 31, (transition period) |  |  | Year Ended September 30, |
|  | income (expense) |  | 2022 |  |  | 2021 |  |  | 2021 |  |  | 2020 |
Amortization of employee pension and postretirement benefits items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service costs |  | Miscellaneous, net |  | $ | 0.8 |  |  | $ | 0.2 |  |  | $ | 0.9 |  |  | $ | 0.7 |
Settlement |  | Miscellaneous, net |  |  | 33.6 |  |  |  | — |  |  |  | — |  |  |  | — |
Actuarial (gains) losses |  | Miscellaneous, net |  |  | 1.3 |  |  |  | 0.3 |  |  |  | 5.2 |  |  |  | 3.1 |
Total before tax |  |  |  |  | 35.7 |  |  |  | 0.5 |  |  |  | 6.1 |  |  |  | 3.8 |
Tax benefit |  |  |  |  | (8.3 | ) |  |  | (0.1 | ) |  |  | (1.5 | ) |  |  | (1.0 | )
Net of tax |  |  |  | $ | 27.4 |  |  | $ | 0.4 |  |  | $ | 4.6 |  |  | $ | 2.8 |

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