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Derivative Financial Instruments and Fair Value Measurements - Schedule of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Derivative [Line Items]    
Other current assets $ 9.5 $ 9.2
Other non-current assets 12.9 16.5
Other current liabilities (0.9) (0.9)
Other long-term liabilities (2.7) (3.6)
Credit facility investment 5.4 21.9
Equity investment 13.2 19.4
Total net assets at fair value 37.4 62.5
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Derivative [Line Items]    
Other current assets 0.0 0.0
Other non-current assets 0.0 0.0
Other current liabilities 0.0 0.0
Other long-term liabilities 0.0 0.0
Credit facility investment 0.0 0.0
Equity investment 13.2 19.4
Total net assets at fair value 13.2 19.4
Significant Observable Inputs (Level 2)    
Derivative [Line Items]    
Other current assets 9.5 9.2
Other non-current assets 12.9 16.5
Other current liabilities (0.9) (0.9)
Other long-term liabilities (2.7) (3.6)
Credit facility investment 0.0 0.0
Equity investment 0.0 0.0
Total net assets at fair value 18.8 21.2
Significant Unobservable Inputs (Level 3)    
Derivative [Line Items]    
Other current assets 0.0 0.0
Other non-current assets 0.0 0.0
Other current liabilities 0.0 0.0
Other long-term liabilities 0.0 0.0
Credit facility investment 5.4 21.9
Equity investment 0.0 0.0
Total net assets at fair value $ 5.4 $ 21.9