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Reclassifications out of Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Sep. 30, 2023
Reclassifications out of Accumulated Other Comprehensive Loss |
Schedule of accumulated balances and reporting period activities related to reclassifications out of accumulated other comprehensive loss | The accumulated balances and reporting period activities for the years ended September 30, 2023, 2022 and 2021 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​ | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Loss on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ |  | Adjustments |  | Adjustments |  | Instruments |  | Loss
Balances at September 30, 2021 | ​ | $ | (316.2) | ​ | $ | (580.1) | ​ | $ | (4.1) | ​ | $ | (900.4)
Other comprehensive income (loss) before reclassification | ​ | ​ | 89.9 | ​ | ​ | (238.7) | ​ | ​ | 37.9 | ​ | ​ | (110.9)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 9.0 | ​ |  | 19.5 | ​ |  | 3.1 | ​ |  | 31.6
Balances at September 30, 2022 | ​ | $ | (217.3) | ​ | $ | (799.3) | ​ | $ | 36.9 | ​ | $ | (979.7)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​ | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Loss on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ |  | Adjustments |  | Adjustments |  | Instruments |  | Loss
Balances at September 30, 2022 | ​ | $ | (217.3) | ​ | $ | (799.3) | ​ | $ | 36.9 | ​ | $ | (979.7)
Other comprehensive (loss) income before reclassification | ​ | ​ | (10.9) | ​ | ​ | 59.6 | ​ | ​ | 10.7 | ​ | ​ | 59.4
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 2.2 | ​ |  | — | ​ |  | (8.5) | ​ |  | (6.3)
Balances at September 30, 2023 | ​ | $ | (226.0) | ​ | $ | (739.7) | ​ | $ | 39.1 | ​ | $ | (926.6)
​

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