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Derivative Financial Instruments and Hedging Loss (Gain) recognized in earnings from derivative instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments, Loss (Gain) [Line Items]      
Expense (income) on swaps, net $ 15.7 $ (39.9) $ (268.0)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0.0 0.0 (7.1)
Commodity and energy contracts      
Derivative Instruments, Loss (Gain) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 37.3 $ 35.2 $ (60.7)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of goods sold Cost of goods sold Cost of goods sold
Foreign exchange contracts      
Derivative Instruments, Loss (Gain) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 0.8 $ (0.1) $ 0.1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative expenses Selling, general and administrative expenses Selling, general and administrative expenses
Interest rate swap      
Derivative Instruments, Loss (Gain) [Line Items]      
Expense (income) on swaps, net $ 15.7 $ (39.9) $ (268.0)
PHPC warrants      
Derivative Instruments, Loss (Gain) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 0.0 $ (1.0) $ (8.2)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)