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Share-Based Compensation (Compensation Cost Recognized in Income Statement) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Payment Arrangement, Additional Disclosure [Abstract]        
Before-tax share-based compensation cost $ 12.5 $ 9.8 $ 41.4 $ 31.0
Income tax benefit (3.0) (2.3) (9.8) (7.3)
After-tax share-based compensation cost $ 9.5 $ 7.5 $ 31.6 $ 23.7