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Accumulated Other Comprehensive Loss, Net (Tables)
 12 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Loss
The following table summarizes the changes in accumulated other comprehensive loss for the years ended September 30, 2024, 2023, and 2022.
(in millions)Foreign Currency Translation Adjustment Pension Benefits Adjustment Cash Flow HedgeAccumulated Other Comprehensive Loss, net
Balances as of September 30, 2021$(22.7)$(2.4)$— $(25.1)
Other comprehensive loss net of tax(11.7)(0.3)(53.5)(65.5)
Balances as of September 30, 2022$(34.4)$(2.7)$(53.5)$(90.6)
Other comprehensive income net of tax3.2 0.5 35.1 38.8 
Balances as of September 30, 2023$(31.2)$(2.2)$(18.4)$(51.8)
Other comprehensive income/(loss) net of tax(0.1)1.0 25.7 26.6 
Balances as of September 30, 2024$(31.3)$(1.2)$7.3 $(25.2)