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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Sep. 30, 2020
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss) | 20. 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, 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 | )
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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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