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Share-Based Compensation (Compensation Cost Recognized in Income Statement) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]        
Before-Tax Share-Based Compensation Cost $ 9.5 $ 8.1 $ 18.5 $ 16.4
Income Tax Benefit (3.3) (2.7) (6.3) (5.5)
After-Tax Share-Based Compensation Cost $ 6.2 $ 5.4 $ 12.2 $ 10.9