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Fair Value Measurements and Derivative Instruments - Summary of Effects on Consolidated Financial Statements of Designated As Cash Flow Hedges (Details) - Cash Flow Hedges - Designated - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Interest Rate Contracts      
Derivative Instruments Gain Loss [Line Items]      
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income (Expense), Operating Interest Income (Expense), Operating Interest Income (Expense), Operating
(Loss) income recognized in Other comprehensive (loss) income $ (13.3) $ 36.1 $ 6.1
Net gain (loss) reclassified from Accumulated other comprehensive (loss) income into Interest expense, net $ 11.1 $ 15.2 $ (0.5)
Fuel Swap Contracts      
Derivative Instruments Gain Loss [Line Items]      
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Goods and Services Sold Cost of Goods and Services Sold Cost of Goods and Services Sold
(Loss) income recognized in Other comprehensive (loss) income $ (0.5) $ 0.0 $ 0.2
Net gain (loss) reclassified from Accumulated other comprehensive (loss) income into Interest expense, net $ 0.0 $ 0.0 $ 1.5