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Restructuring And Related Charges (Summary Of Costs Incurred By Reporting Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges $ 92.8 $ 60.4 $ 14.0
Cumulative costs 146.4    
Future costs to be incurred 3.7    
Corporate [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 7.5 0.5  
Hardware & Home Improvement [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 52.8 26.6 2.3
Cumulative costs 79.4    
Future costs to be incurred 3.7    
Global Pet Supplies [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 13.2 9.1 6.0
Cumulative costs 20.4    
Home and Garden [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 0.8   0.4
Global Auto Care [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 18.5 $ 24.2 $ 5.3
Cumulative costs $ 46.6