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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 04, 2021
Mar. 29, 2020
Apr. 04, 2021
Mar. 29, 2020
Sep. 30, 2020
Related Party Transaction [Line Items]          
Net income (loss) $ 36.6 $ (57.0) $ 108.7 $ (92.7)  
TSAs and reverse TSAs          
Related Party Transaction [Line Items]          
Net income (loss) 0.1 (1.5) (1.7) 0.1  
TSAs          
Related Party Transaction [Line Items]          
TSA charges 0.1 2.2 0.9 6.6  
Reverse TSAs          
Related Party Transaction [Line Items]          
TSA charges   3.7 $ 2.6 6.5  
Minimum | TSAs and reverse TSAs          
Related Party Transaction [Line Items]          
Overall expected time period of transition     12 months    
Maximum | TSAs and reverse TSAs          
Related Party Transaction [Line Items]          
Overall expected time period of transition     24 months    
Energizer | TSAs and reverse TSAs          
Related Party Transaction [Line Items]          
Net receivable 2.1   $ 2.1   $ 5.4
Energizer | H&G supply agreement          
Related Party Transaction [Line Items]          
Net receivable 0.1   $ 0.1   4.4
Supply agreement contract term     24 months    
Revenue 1.9 $ 5.6 $ 6.0 $ 10.9  
Varta AG | TSAs and reverse TSAs          
Related Party Transaction [Line Items]          
Net payable $ 1.1   $ 1.1   $ 1.0