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Share-Based Compensation (Compensation Cost Recognized in Income Statement) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Before-Tax Share-Based Compensation $ 37.6 $ 45.7 $ 44.0
Discontinued Operations [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Before-Tax Share-Based Compensation 6.6 6.2 6.0
Continuing Operations [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Before-Tax Share-Based Compensation 31.0 39.5 38.0
Income Tax Benefit (10.8) (13.8) (13.5)
After-Tax Share-Based Compensation $ 20.2 $ 25.7 $ 24.5