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Reclassifications out of Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Sep. 30, 2021
Reclassifications out of Accumulated Other Comprehensive Loss |
Schedule of accumulated balances and reporting period activities related to reclassifications out of accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Foreign |  | ​ | ​ |  | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Loss on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ | ​ | Adjustments | ​ | Adjustments | ​ | Instruments | ​ | Loss
Balances at September 30, 2018 | ​ | $ | (202.3) | ​ | $ | (502.2) | ​ | $ | 1.2 | ​ | $ | (703.3)
Other comprehensive income (loss) before reclassification | ​ |  | (107.2) | ​ |  | (46.5) | ​ |  | (17.2) | ​ |  | (170.9)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 6.8 | ​ |  | — | ​ |  | 3.2 | ​ |  | 10.0
Balances at September 30, 2019 | ​ | $ | (302.7) | ​ | $ | (548.7) | ​ | $ | (12.8) | ​ | $ | (864.2)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​ | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Loss on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ |  | Adjustments |  | Adjustments |  | Instruments |  | Loss
Balances at September 30, 2019 | ​ | $ | (302.7) | ​ | $ | (548.7) | ​ | $ | (12.8) | ​ | $ | (864.2)
Other comprehensive income (loss) before reclassification | ​ | ​ | (72.5) | ​ | ​ | (18.6) | ​ | ​ | (5.3) | ​ | ​ | (96.4)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 32.4 | ​ |  | — | ​ |  | 9.5 | ​ |  | 41.9
Balances at September 30, 2020 | ​ | $ | (342.8) | ​ | $ | (567.3) | ​ | $ | (8.6) | ​ | $ | (918.7)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​ | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Loss on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ |  | Adjustments |  | Adjustments |  | Instruments |  | Loss
Balances at September 30, 2020 | ​ | $ | (342.8) | ​ | $ | (567.3) | ​ | $ | (8.6) | ​ | $ | (918.7)
Other comprehensive income (loss) before reclassification | ​ | ​ | 14.6 | ​ | ​ | (12.8) | ​ | ​ | 0.8 | ​ | ​ | 2.6
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 12.0 | ​ |  | — | ​ |  | 3.7 | ​ |  | 15.7
Balances at September 30, 2021 | ​ | $ | (316.2) | ​ | $ | (580.1) | ​ | $ | (4.1) | ​ | $ | (900.4)

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