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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2020
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, 2017 |  | $ | (46.2 | ) |  | $ | (78.6 | ) |  | $ | (0.2 | ) |  | $ | (125.0 | )
Other comprehensive income (loss) before reclassifications |  |  | 33.1 |  |  |  | (17.6 | ) |  |  | 0.6 |  |  |  | 16.1 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 2.2 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 2.1 |
Net current period other comprehensive income (loss) |  |  | 35.3 |  |  |  | (17.6 | ) |  |  | 0.5 |  |  |  | 18.2 |
Balance at September 30, 2018 |  |  | (10.9 | ) |  |  | (96.2 | ) |  |  | 0.3 |  |  |  | (106.8 | )
Tax impact of U.S. tax reform on Accumulated Other Comprehensive Income (ASU 2018-02) |  |  | (9.1 | ) |  |  | — |  |  |  | — |  |  |  | (9.1 | )
Balance at October 1, 2018 |  |  | (20.0 | ) |  |  | (96.2 | ) |  |  | 0.3 |  |  |  | (115.9 | )
Other comprehensive income (loss) before reclassifications |  |  | (49.5 | ) |  |  | (36.3 | ) |  |  | — |  |  |  | (85.8 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Net current period other comprehensive income (loss) |  |  | (49.4 | ) |  |  | (36.3 | ) |  |  | — |  |  |  | (85.7 | )
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 | )
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 |  | Fiscal Year Ended September 30, |
|  | income (expense) |  | 2020 |  |  | 2019 |  |  | 2018 |
Amortization of employee pension and postretirement benefits items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service costs |  | Miscellaneous, net |  | $ | 0.7 |  |  | $ | 0.2 |  |  | $ | 0.9 |
Actuarial (gains) losses |  | Miscellaneous, net |  |  | 3.1 |  |  |  | — |  |  |  | 2.0 |
Total before tax |  |  |  |  | 3.8 |  |  |  | 0.2 |  |  |  | 2.9 |
Tax benefit |  |  |  |  | (1.0 | ) |  |  | (0.1 | ) |  |  | (0.7 | )
Net of tax |  |  |  | $ | 2.8 |  |  | $ | 0.1 |  |  | $ | 2.2 |

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