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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, 2019
USD ($)
Goodwill [Line Items]  
As of September 30, 2018 $ 1,454.7
Foreign currency impact (3.7)
As of June 30, 2019 1,451.0
Hardware & Home Improvement [Member]  
Goodwill [Line Items]  
As of September 30, 2018 704.3
Foreign currency impact (1.0)
As of June 30, 2019 703.3
Global Pet Supplies [Member]  
Goodwill [Line Items]  
As of September 30, 2018 435.9
Foreign currency impact (2.2)
As of June 30, 2019 433.7
Home and Garden [Member]  
Goodwill [Line Items]  
As of September 30, 2018 196.5
Foreign currency impact
As of June 30, 2019 196.5
Home And Personal Care [Member]  
Goodwill [Line Items]  
As of September 30, 2018 118.0
Foreign currency impact (0.5)
As of June 30, 2019 $ 117.5