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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 03, 2021
Dec. 29, 2019
Sep. 30, 2020
Related Party Transaction [Line Items]      
Net income (loss) $ 72.1 $ (35.8)  
GBL      
Related Party Transaction [Line Items]      
Indemnifications, acquisition agreement 37.2   $ 51.6
GBL | Indemnification payable | Energizer      
Related Party Transaction [Line Items]      
Net settlement payable 17.5   33.0
GBL | Other Long-Term Liabilities      
Related Party Transaction [Line Items]      
Net settlement payable 19.7   18.6
TSAs and reverse TSAs      
Related Party Transaction [Line Items]      
Net income (loss) (1.8) 1.6  
TSAs      
Related Party Transaction [Line Items]      
TSA charges 0.8 4.4  
Reverse TSAs      
Related Party Transaction [Line Items]      
TSA charges $ 2.6 2.8  
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 $ 3.8   5.4
Energizer | H&G supply agreement      
Related Party Transaction [Line Items]      
Net receivable $ 2.7 4.4  
Supply agreement contract term 24 months    
Revenue $ 4.1 $ 5.3  
Varta AG | TSAs and reverse TSAs      
Related Party Transaction [Line Items]      
Net payable $ (0.4)   $ (1.0)