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Segment Information (Segment Total Assets Relating To Segments) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 5,789.5 $ 5,543.6
SB/RH [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 5,672.0 5,424.0
Operating Segments [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 4,957.7 5,160.0
Operating Segments [Member] | SB/RH [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 4,957.7 5,160.0
Operating Segments [Member] | Hardware & Home Improvement [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,641.1 1,698.2
Operating Segments [Member] | Hardware & Home Improvement [Member] | SB/RH [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,641.1 1,698.2
Operating Segments [Member] | Global Pet Supplies [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,367.1 1,395.5
Operating Segments [Member] | Global Pet Supplies [Member] | SB/RH [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,367.1 1,395.5
Operating Segments [Member] | Home and Garden [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 526.7 546.0
Operating Segments [Member] | Home and Garden [Member] | SB/RH [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 526.7 546.0
Operating Segments [Member] | Global Auto Care [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,422.8 1,520.3
Operating Segments [Member] | Global Auto Care [Member] | SB/RH [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,422.8 1,520.3
Corporate [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 831.8 383.6
Corporate [Member] | SB/RH [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 714.3 $ 264.0