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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Related Party Transaction [Line Items]          
Selling, general and administrative expenses $ 55.1 $ 47.8 $ 151.1 $ 133.5  
Accounts payable 96.3   96.3   $ 93.8
Cash distributions directly to related parties       3.2  
Related Party          
Related Party Transaction [Line Items]          
Cost incurred related reimbursable costs pursuant to Co-Packaging Agreement 0.9   0.9    
Accounts payable 1.4   1.4   $ 1.4
Master services agreement fees | Related Party          
Related Party Transaction [Line Items]          
Selling, general and administrative expenses $ 0.8 $ 1.4 $ 3.1 $ 3.2