Share-Based Compensation (Compensation Cost Recognized in Income Statement) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Before-Tax Share-Based Compensation | $ 38.8 | $ 40.7 | $ 37.6 |
Discontinued Operations | |||
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Before-Tax Share-Based Compensation | 0.0 | 0.8 | 6.6 |
Continuing Operations | |||
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Before-Tax Share-Based Compensation | 38.8 | 39.9 | 31.0 |
Income Tax Benefit | (9.1) | (14.0) | (10.8) |
After-Tax Share-Based Compensation | $ 29.7 | $ 25.9 | $ 20.2 |