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Share-Based Compensation (Compensation Cost Recognized in Income Statement) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]    
Before-Tax Share-Based Compensation Cost $ 9.0 $ 8.3
Income Tax Benefit (3.0) (2.8)
After-Tax Share-Based Compensation Cost $ 6.0 $ 5.5