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Subsequent Events (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 11, 2018
Nov. 15, 2018
Dec. 31, 2018
Sep. 30, 2018
Global Battery And Lighting [Member]        
Subsequent Event [Line Items]        
Write-down of assets of business held for sale to fair value less cost to sell       $ 0.0
Global Auto Care [Member]        
Subsequent Event [Line Items]        
Write-down of assets of business held for sale to fair value less cost to sell       $ 107.2
Global Auto Care [Member] | Forecast [Member]        
Subsequent Event [Line Items]        
Write-down of assets of business held for sale to fair value less cost to sell     $ 107.2  
Energizer [Member] | Global Battery And Lighting [Member] | Downward Adjustment Equal To 75% [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Purchase price adjustment $ 600.0      
Energizer [Member] | Global Battery And Lighting [Member] | Upward Adjustment Equal To 25% [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Purchase price adjustment $ 200.0      
Energizer [Member] | Global Auto Care [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Purchase price   $ 1,250.0    
Cash from divestiture   $ 937.5    
Common Stock [Member] | Energizer [Member] | Global Auto Care [Member]        
Subsequent Event [Line Items]        
Stock consideration, shares   5.3    
Stock consideration, value   $ 312.5    
Common Stock [Member] | Energizer [Member] | Global Auto Care [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Stock consideration, shares   5.3    
Stock consideration, value   $ 312.5    
Maximum [Member] | Energizer [Member] | Global Battery And Lighting [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Potential downward adjustment, percentage 75.00%      
Potential upward adjustment, percentage 25.00%