Share Based Compensation (Summary Of Activity Of The RSUs Granted) (Details) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	1.5
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 53.05
Grants, Fair Value at Grant Date | $	$ 79.5
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.6
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 53.21
Grants, Fair Value at Grant Date | $	$ 31.4
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.9
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 52.95
Grants, Fair Value at Grant Date | $	$ 48.1
Performance-Based RSUs [Member] | Vesting In Less Than 24 Months [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.4
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 53.00
Grants, Fair Value at Grant Date | $	$ 24.0
Performance-Based RSUs [Member] | Vesting In More Than 24 Months [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.5
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 52.89
Grants, Fair Value at Grant Date | $	$ 24.1
SB/RH [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	1.5
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 52.76
Grants, Fair Value at Grant Date | $	$ 78.0
SB/RH [Member] | Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.6
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 52.45
Grants, Fair Value at Grant Date | $	$ 29.9
SB/RH [Member] | Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.9
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 52.95
Grants, Fair Value at Grant Date | $	$ 48.1
SB/RH [Member] | Performance-Based RSUs [Member] | Vesting In Less Than 24 Months [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.4
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 53.00
Grants, Fair Value at Grant Date | $	$ 24.0
SB/RH [Member] | Performance-Based RSUs [Member] | Vesting In More Than 24 Months [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Shares | shares	0.5
Grants, Weighted Average Grant Date Fair Value | $ / shares	$ 52.89
Grants, Fair Value at Grant Date | $	$ 24.1