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Income Taxes - Provisions for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Current expense (benefit):      
Federal $ 44.2 $ 97.1 $ 102.4
State 20.9 32.2 30.7
Foreign 78.7 36.0 37.0
Investment tax credit 0.0 (1.2) (1.6)
Total current expense 143.8 164.1 168.5
Deferred expense (benefit):      
Federal 81.2 28.1 61.9
State 1.3 2.9 7.8
Foreign (4.8) (17.0) (2.7)
Investment tax credit amortization (0.3) (0.3) (0.3)
Total deferred expense 77.4 13.7 66.7
Total income tax expense $ 221.2 $ 177.8 $ 235.2