Share-Based Compensation (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Share-Based Compensation (Textual) [Abstract]
Allocated Share-based Compensation Expense	$ 10.0	$ 10.9	$ 21.2	$ 22.3
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period			1,083	1,383
Share-based Compensation Arrangement by Share-based Payment Award Options, Grants in Period Weighted Average Grant Date Fair Value			$ 25.17	$ 23.51
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period			79	93
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 98.15	$ 101.57
Restricted stock and restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period			64	81
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 80.08	$ 73.87
Unrestricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period			10	12
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 75.20	$ 61.97