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Redeemable Noncontrolling Interest (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Oct. 21, 2019
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, beginning of period $ 2,021.6      
Net earnings attributable to NCI after IPO 25.1 $ 20.3    
Net earnings available to Class A Common Stockholders 7.8 6.0    
Redeemable noncontrolling interest, end of period 2,369.6      
Level 1        
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, beginning of period 2,021.6      
Redeemable noncontrolling interest, end of period 2,369.6      
BellRing Brands, Inc.        
Redeemable Noncontrolling Interest [Line Items]        
Net earnings available to Class A Common Stockholders 7.8 6.0    
Impact of initial public offering 0.0 1,364.6    
Redemption value adjustment to redeemable noncontrolling interest 321.9 689.8    
Changes from net earnings available to Class A Common Stockholders and transfers to NCI $ 329.7 2,060.4    
BellRing Brands, LLC unit | Post Holdings, Inc.        
Redeemable Noncontrolling Interest [Line Items]        
Common units, outstanding 97.5   97.5  
Noncontrolling interest, ownership percentage by noncontrolling owners 71.20%   71.20% 100.00%
BellRing Brands, LLC unit | BellRing Brands, Inc.        
Redeemable Noncontrolling Interest [Line Items]        
Noncontrolling interest, ownership percentage by parent 28.80%   28.80%  
Redeemable noncontrolling interest        
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, beginning of period $ 2,021.6 0.0    
Net earnings attributable to NCI after IPO 25.1 20.3    
Net change in hedges, net of tax 0.4 0.4    
Foreign currency translation adjustments 0.6 0.1    
Impact of initial public offering 0.0 1,364.6    
Redemption value adjustment to redeemable noncontrolling interest 321.9 689.8    
Redeemable noncontrolling interest, end of period $ 2,369.6 $ 2,075.2