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Reclassifications out of Accumulated Other Comprehensive Loss
 12 Months Ended
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Reclassifications out of Accumulated Other Comprehensive Loss Reclassifications out of Accumulated Other Comprehensive Loss
The accumulated balances and reporting period activities for the years ended September 30, 2025, 2024 and 2023 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions):
Pension Related AdjustmentsForeign Currency Translation AdjustmentsLoss on Derivative InstrumentsAccumulated Other Comprehensive Loss
Balances at September 30, 2022$(217.3)$(799.3)$36.9 $(979.7)
Other comprehensive income (loss) before reclassification(10.9)59.6 10.7 59.4 
Amounts reclassified from accumulated other comprehensive loss2.2 — (8.5)(6.3)
Balances at September 30, 2023$(226.0)$(739.7)$39.1 $(926.6)
Pension Related AdjustmentsForeign Currency Translation AdjustmentsLoss on Derivative InstrumentsAccumulated Other Comprehensive Loss
Balances at September 30, 2023$(226.0)$(739.7)$39.1 $(926.6)
Other comprehensive (loss) income before reclassification(26.6)93.2 (10.6)56.0 
Amounts reclassified from accumulated other comprehensive loss0.6 — (12.7)(12.1)
Balances at September 30, 2024$(252.0)$(646.5)$15.8 $(882.7)
Pension Related AdjustmentsForeign Currency Translation AdjustmentsLoss on Derivative InstrumentsAccumulated Other Comprehensive Loss
Balances at September 30, 2024$(252.0)$(646.5)$15.8 $(882.7)
Other comprehensive (loss) income before reclassification(1.3)(5.9)4.8 (2.4)
Amounts reclassified from accumulated other comprehensive loss1.9 — (9.8)(7.9)
Balances at September 30, 2025$(251.4)$(652.4)$10.8 $(893.0)