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Goodwill And Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Intangible Assets [Line Items]        
Impairment of goodwill   $ 116.0    
Indefinite-lived intangible assets $ 240.4 240.4    
Impairment of indefinite lived intangible assets   35.4 $ 20.3 $ 16.3
Amortization expense   83.4 53.0 $ 72.1
Tradenames [Member]        
Intangible Assets [Line Items]        
Indefinite-lived intangible assets 1,011.1 1,011.1 1,064.4  
Hardware & Home Improvement [Member]        
Intangible Assets [Line Items]        
Impairment of goodwill      
Percentage of reporting units exceeded carrying values by   33.00%    
Global Pet Supplies [Member]        
Intangible Assets [Line Items]        
Impairment of goodwill      
Percentage of reporting units exceeded carrying values by   4.00%    
Global Pet Supplies [Member] | Tradenames [Member]        
Intangible Assets [Line Items]        
Impairment of indefinite lived intangible assets   $ 16.6    
Global Pet Supplies [Member] | Tradenames [Member] | Tradenames [Member]        
Intangible Assets [Line Items]        
Impairment of indefinite lived intangible assets     $ 20.3  
Home And Garden [Member]        
Intangible Assets [Line Items]        
Impairment of goodwill      
Percentage of reporting units exceeded carrying values by   56.00%    
Home And Personal Care [Member]        
Intangible Assets [Line Items]        
Impairment of goodwill $ 116.0 $ 116.0    
Amortization expense   15.5    
Home And Personal Care [Member] | Tradenames [Member]        
Intangible Assets [Line Items]        
Impairment of indefinite lived intangible assets   18.8    
HHI, GPC, and H&G [Member]        
Intangible Assets [Line Items]        
Impairment of goodwill   $ 0.0