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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Related Party Transaction [Line Items]          
Cash distributions directly to related parties       $ 3.2  
Accounts payable $ 105.0   $ 105.0   $ 93.8
Selling, general and administrative expenses 54.3 $ 48.9 96.0 85.7  
Related Party          
Related Party Transaction [Line Items]          
Accounts payable 0.4   0.4   $ 1.4
Master services agreement fees | Related Party          
Related Party Transaction [Line Items]          
Selling, general and administrative expenses $ 1.0 $ 1.2 $ 2.3 $ 1.8