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Income Taxes - Provisions for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Current expense (benefit): |  |  |
Federal | $ 97.1 | $ 102.4 | $ 53.3
State | 32.2 | 30.7 | 25.1
Foreign | 36.0 | 37.0 | 37.3
Investment tax credit | (1.2) | (1.6) | (1.6)
Total current expense | 164.1 | 168.5 | 114.1
Deferred expense (benefit): |  |  |
Federal | 28.1 | 61.9 | 54.6
State | 2.9 | 7.8 | (0.7)
Foreign | (17.0) | (2.7) | (4.9)
Investment tax credit amortization | (0.3) | (0.3) | (0.3)
Total deferred expense | 13.7 | 66.7 | 48.7
Total income tax expense | $ 177.8 | $ 235.2 | $ 162.8

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