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Segment Information (Net Sales Relating To Segments) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Revenue from External Customer [Line Items]        
Net sales $ 906.7 $ 882.6 $ 1,787.0 $ 1,804.9
Operating Segments [Member]        
Revenue from External Customer [Line Items]        
Net sales 906.7 882.6 1,787.0 1,804.9
Hardware & Home Improvement [Member] | Operating Segments [Member]        
Revenue from External Customer [Line Items]        
Net sales 331.1 318.5 636.2 644.4
Home And Personal Care [Member] | Operating Segments [Member]        
Revenue from External Customer [Line Items]        
Net sales 221.7 231.1 538.9 573.1
Global Pet Supplies [Member] | Operating Segments [Member]        
Revenue from External Customer [Line Items]        
Net sales 214.9 211.2 419.6 413.6
Home and Garden [Member] | Operating Segments [Member]        
Revenue from External Customer [Line Items]        
Net sales $ 139.0 $ 121.8 $ 192.3 $ 173.8