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Income Taxes - Provisions for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Current expense (benefit):      
Federal $ (2.7) $ 44.2 $ 97.1
State 14.0 20.9 32.2
Foreign 56.2 78.7 36.0
Investment tax credit 0.0 0.0 (1.2)
Total current expense 67.5 143.8 164.1
Deferred expense (benefit):      
Federal 125.8 81.2 28.1
State 16.4 1.3 2.9
Foreign (31.8) (4.8) (17.0)
Investment tax credit amortization (0.3) (0.3) (0.3)
Total deferred expense 110.1 77.4 13.7
Total income tax expense $ 177.6 $ 221.2 $ 177.8