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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Mar. 31, 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):
|  | Three Months Ended March 31, 2020 |
|  | Employee Pension and Postretirement Benefits, Net of Tax |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments, Net of Tax |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at beginning of period |  | $ | (68.7 | ) |  | $ | (113.0 | ) |  | $ | (0.2 | ) |  | $ | (181.9 | )
Other comprehensive income (loss) before reclassifications |  |  | — |  |  |  | (28.4 | ) |  |  | 0.7 |  |  |  | (27.7 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.7 |  |  |  | — |  |  |  | — |  |  |  | 0.7 |
Net current period other comprehensive income (loss) |  |  | 0.7 |  |  |  | (28.4 | ) |  |  | 0.7 |  |  |  | (27.0 | )
Balance at end of period |  | $ | (68.0 | ) |  | $ | (141.4 | ) |  | $ | 0.5 |  |  | $ | (208.9 | )
|  | Three Months Ended March 31, 2019 |
|  | Employee Pension and Postretirement Benefits, Net of Tax |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments, Net of Tax |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at beginning of period |  | $ | (20.0 | ) |  | $ | (105.0 | ) |  | $ | 0.3 |  |  | $ | (124.7 | )
Other comprehensive income (loss) before reclassifications |  |  | (3.9 | ) |  |  | (6.9 | ) |  |  | (0.2 | ) |  |  | (11.0 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Net current period other comprehensive income (loss) |  |  | (3.8 | ) |  |  | (6.9 | ) |  |  | (0.2 | ) |  |  | (10.9 | )
Balance at end of period |  | $ | (23.8 | ) |  | $ | (111.9 | ) |  | $ | 0.1 |  |  | $ | (135.6 | )
|  | Six Months Ended March 31, 2020 |
|  | Employee Pension and Postretirement Benefits, Net of Tax |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments, Net of Tax |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at beginning of period |  | $ | (69.4 | ) |  | $ | (132.5 | ) |  | $ | 0.3 |  |  | $ | (201.6 | )
Other comprehensive income (loss) before reclassifications |  |  | — |  |  |  | (8.9 | ) |  |  | 0.2 |  |  |  | (8.7 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 1.4 |  |  |  | — |  |  |  | — |  |  |  | 1.4 |
Net current period other comprehensive income (loss) |  |  | 1.4 |  |  |  | (8.9 | ) |  |  | 0.2 |  |  |  | (7.3 | )
Balance at end of period |  | $ | (68.0 | ) |  | $ | (141.4 | ) |  | $ | 0.5 |  |  | $ | (208.9 | )
|  | Six Months Ended March 31, 2019 |
|  | 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, 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 beginning of period |  |  | (20.0 | ) |  |  | (96.2 | ) |  |  | 0.3 |  |  |  | (115.9 | )
Other comprehensive income (loss) before reclassifications |  |  | (3.9 | ) |  |  | (15.7 | ) |  |  | (0.2 | ) |  |  | (19.8 | )
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Net current period other comprehensive income (loss) |  |  | (3.8 | ) |  |  | (15.7 | ) |  |  | (0.2 | ) |  |  | (19.7 | )
Balance at end of period |  | $ | (23.8 | ) |  | $ | (111.9 | ) |  | $ | 0.1 |  |  | $ | (135.6 | )
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) on Condensed Consolidated Statements of Income | The effects of the reclassifications out of Accumulated other comprehensive income (loss) on the Condensed Consolidated Statements of Income were as follows (in millions):
|  | Classification of income (expense) |  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Amortization of employee pension and postretirement benefits items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service costs |  | Miscellaneous, net |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.2 |
Actuarial (gains) losses |  | Miscellaneous, net |  |  | 0.8 |  |  |  | 0.1 |  |  |  | 1.5 |  |  |  | — |
Total before tax |  |  |  |  | 0.9 |  |  |  | 0.3 |  |  |  | 1.8 |  |  |  | 0.2 |
Tax provision (benefit) |  |  |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.4 | ) |  |  | (0.1 | )
Net of tax |  |  |  | $ | 0.7 |  |  | $ | 0.1 |  |  | $ | 1.4 |  |  | $ | 0.1 |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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