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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, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Before-Tax Share-Based Compensation $ 11.6 $ 12.3 $ 23.4 $ 22.4
Income Tax Benefit (3.9) (4.5) (8.2) (8.1)
After-Tax Share-Based Compensation $ 7.7 $ 7.8 $ 15.2 $ 14.3