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Share-Based Compensation (Cost recognized in Income Statement) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Before-Tax Share-Based Compensation $ 10.6 $ 8.8 $ 33.0 $ 36.2
Income Tax Benefit (3.8) (3.1) (11.9) (13.0)
After-Tax Share-Based Compensation $ 6.8 $ 5.7 $ 21.1 $ 23.2