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Reclassifications out of Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Mar. 31, 2024
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 and six months ended March 31, 2024 and 2023 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 December 31, 2023 | ​ | $ | (235.0) | ​ | $ | (679.7) | ​ | $ | 24.9 | ​ | $ | (889.8)
Other comprehensive income (loss) before reclassification | ​ |  | 1.9 | ​ | ​ | (27.0) | ​ | ​ | 8.3 | ​ | ​ | (16.8)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 0.1 | ​ | ​ | — | ​ | ​ | (3.5) | ​ | ​ | (3.4)
Balances at March 31, 2024 | ​ | $ | (233.0) | ​ | $ | (706.7) | ​ | $ | 29.7 | ​ | $ | (910.0)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Foreign |  |  | ​ |  | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Gain/(Loss) on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ |  | Adjustments |  | Adjustments |  | Instruments |  | Loss
Balances at December 31, 2022 | ​ | $ | (232.1) | ​ | $ | (721.4) | ​ | $ | 35.1 | ​ | $ | (918.4)
Other comprehensive (loss) income before reclassification | ​ | ​ | (4.2) | ​ | ​ | 8.5 | ​ | ​ | (5.6) | ​ | ​ | (1.3)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 0.5 | ​ | ​ | — | ​ | ​ | (1.9) | ​ | ​ | (1.4)
Balances at March 31, 2023 | ​ | $ | (235.8) | ​ | $ | (712.9) | ​ | $ | 27.6 | ​ | $ | (921.1)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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 | ​ | ​ | (7.2) | ​ | ​ | 33.0 | ​ | ​ | (2.3) | ​ | ​ | 23.5
Amounts reclassified from accumulated other comprehensive loss | ​ | ​ | 0.2 | ​ | ​ | — | ​ | ​ | (7.1) | ​ | ​ | (6.9)
Balances at March 31, 2024 | ​ | $ | (233.0) | ​ | $ | (706.7) | ​ | $ | 29.7 | ​ | $ | (910.0)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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 (loss) income before reclassification | ​ |  | (19.6) | ​ | ​ | 86.4 | ​ | ​ | (7.4) | ​ | ​ | 59.4
Amounts reclassified from accumulated other comprehensive income (loss) | ​ | ​ | 1.1 | ​ | ​ | — | ​ | ​ | (1.9) | ​ | ​ | (0.8)
Balances at March 31, 2023 | ​ | $ | (235.8) | ​ | $ | (712.9) | ​ | $ | 27.6 | ​ | $ | (921.1)
​

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