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Goodwill And Intangible Assets (Changes In The Carrying Amount Of Goodwill By Reporting Segment) (Details)
$ in Millions
9 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Line Items]  
As of September 30, beginning $ 2,277.1
Foreign currency impact (7.7)
As of June 30, ending 2,269.4
Hardware & Home Improvement [Member]  
Goodwill [Line Items]  
As of September 30, beginning 708.7
Foreign currency impact (5.4)
As of June 30, ending 703.3
Global Pet Supplies [Member]  
Goodwill [Line Items]  
As of September 30, beginning 437.1
Foreign currency impact (1.7)
As of June 30, ending 435.4
Home and Garden [Member]  
Goodwill [Line Items]  
As of September 30, beginning 196.5
Foreign currency impact
As of June 30, ending 196.5
Global Auto Care [Member]  
Goodwill [Line Items]  
As of September 30, beginning 934.8
Foreign currency impact (0.6)
As of June 30, ending $ 934.2