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Share Based Compensation (Summary Of RSU Activity) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants, Shares 0.4    
Grants, Weighted Average Grant Date Fair Value $ 102.96    
Grants, Fair Value at Grant Date $ 45.9    
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance, Shares 0.8 0.6 0.6
Grants, Shares 0.4 0.7 0.6
Forfeited, Shares (0.1) (0.1)
Vested, Shares (0.5) (0.5) (0.5)
Ending balance, Shares 0.6 0.8 0.6
Beginning balance, Weighted Average Grant Date Fair Value $ 114.67 $ 94.97 $ 87.50
Grants, Weighted Average Grant Date Fair Value 102.96 127.00 94.88
Forfeited, Weighted Average Grant Date Fair Value 115.08 118.89 92.26
Vested, Weighted Average Grant Date Fair Value 113.07 109.03 86.97
Ending balance, Weighted Average Grant Date Fair Value $ 107.71 $ 114.67 $ 94.97
Beginning balance, Fair Value at Grant Date $ 87.2 $ 54.8 $ 53.2
Grants, Fair Value at Grant Date 45.9 88.4 56.0
Forfeited, Fair Value at Grant Date (8.5) (1.4) (6.6)
Vested, Fair Value at Grant Date (55.6) (54.6) (47.8)
Ending balance, Fair Value at Grant Date $ 69.0 $ 87.2 $ 54.8
SB/RH [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants, Shares 0.4    
Grants, Weighted Average Grant Date Fair Value $ 102.92    
Grants, Fair Value at Grant Date $ 44.4    
SB/RH [Member] | Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning balance, Shares 0.7 0.5 0.5
Grants, Shares 0.4 0.7 0.6
Forfeited, Shares (0.1) (0.1)
Vested, Shares (0.4) (0.5) (0.5)
Ending balance, Shares 0.6 0.7 0.5
Beginning balance, Weighted Average Grant Date Fair Value $ 116.32 $ 96.92 $ 87.71
Grants, Weighted Average Grant Date Fair Value 102.92 126.85 95.00
Forfeited, Weighted Average Grant Date Fair Value 115.08 118.89 92.26
Vested, Weighted Average Grant Date Fair Value 114.07 111.98 86.78
Ending balance, Weighted Average Grant Date Fair Value $ 108.75 $ 116.32 $ 96.92
Beginning balance, Fair Value at Grant Date $ 82.4 $ 45.3 $ 42.1
Grants, Fair Value at Grant Date 44.4 86.9 54.1
Forfeited, Fair Value at Grant Date (8.5) (1.4) (6.6)
Vested, Fair Value at Grant Date (51.1) (48.4) (44.3)
Ending balance, Fair Value at Grant Date $ 67.2 $ 82.4 $ 45.3