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Goodwill And Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Intangible Assets [Line Items]      
Impairment of indefinite lived intangible assets $ 20.3 $ 16.3 $ 4.7
Amortization expense 53.0 72.1 $ 70.9
Tradenames [Member]      
Intangible Assets [Line Items]      
Indefinite-lived intangible assets $ 1,064.4 $ 1,088.1  
Hardware & Home Improvement [Member]      
Intangible Assets [Line Items]      
Percentage of reporting units exceeded carrying values by 89.00%    
Global Pet Supplies [Member]      
Intangible Assets [Line Items]      
Percentage of reporting units exceeded carrying values by 21.00%    
Home and Garden [Member]      
Intangible Assets [Line Items]      
Percentage of reporting units exceeded carrying values by 222.00%