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Share-Based Compensation (Cost recognized in Income Statement) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Before-Tax Share-Based Compensation	$ 12.3	$ 15.6	$ 22.4	$ 27.4
Income Tax Benefit	(4.5)	(5.8)	(8.1)	(9.9)
After-Tax Share-Based Compensation	$ 7.8	$ 9.8	$ 14.3	$ 17.5

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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