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Segment Information (Net Sales Relating To Segments) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Revenue from External Customer [Line Items]      
Net sales $ 3,802.1 $ 3,808.7 $ 3,705.4
Hardware & Home Improvement [Member] | Operating Segments [Member]      
Revenue from External Customer [Line Items]      
Net sales 1,355.7 1,377.7 1,276.1
Home And Personal Care [Member] | Operating Segments [Member]      
Revenue from External Customer [Line Items]      
Net sales 1,068.1 1,110.4 1,132.3
Global Pet Supplies [Member] | Operating Segments [Member]      
Revenue from External Customer [Line Items]      
Net sales 870.2 820.5 793.2
Home And Garden [Member] | Operating Segments [Member]      
Revenue from External Customer [Line Items]      
Net sales $ 508.1 $ 500.1 $ 503.8