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Reclassifications out of Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Dec. 31, 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 three months ended December 31, 2023 and 2022 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions): ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Gain/(Loss) on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ |  | Adjustments |  | Adjustments |  | Instruments |  | Loss
Balances at September 30, 2023 | ​ | $ | (226.0) | ​ | $ | (739.7) | ​ | $ | 39.1 | ​ | $ | (926.6)
Other comprehensive (loss) income before reclassification | ​ | ​ | (9.1) | ​ | ​ | 60.0 | ​ | ​ | (10.6) | ​ | ​ | 40.3
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | (3.6) | ​ | ​ | (3.5)
Balances at December 31, 2023 | ​ | $ | (235.0) | ​ | $ | (679.7) | ​ | $ | 24.9 | ​ | $ | (889.8)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Gain/(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 income (loss) before reclassification | ​ |  | (15.4) | ​ | ​ | 77.9 | ​ | ​ | (1.8) | ​ | ​ | 60.7
Amounts reclassified from accumulated other comprehensive income (loss) | ​ | ​ | 0.6 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.6
Balances at December 31, 2022 | ​ | $ | (232.1) | ​ | $ | (721.4) | ​ | $ | 35.1 | ​ | $ | (918.4)
​

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