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Related Party Transactions (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Related Party Transaction [Line Items]      
Cash distributions directly to related parties $ 3.2    
Cash distributions on behalf of related parties to third party $ 0.4    
Percentage of tax savings owed to related party 85.00%    
Post Holdings, Inc. | BellRing Brands, LLC unit      
Related Party Transaction [Line Items]      
Common units, outstanding 97.5   97.5
Accounts payable      
Related Party Transaction [Line Items]      
Accounts payable, related parties $ 0.8   $ 1.3
Other liabilities      
Related Party Transaction [Line Items]      
Tax receivable agreement, related parties 10.9   $ 10.9
Master services agreement fees | Selling, general and administrative expenses      
Related Party Transaction [Line Items]      
Expenses from transactions with related party 0.6 $ 0.5  
Share-based payment arrangement | Selling, general and administrative expenses      
Related Party Transaction [Line Items]      
Expenses from transactions with related party $ 0.8 $ 1.1