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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

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