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Income Taxes - Provisions for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Current expense (benefit): |  |  |
Federal | $ (2.7) | $ (2.7) | $ 44.2
State | 26.0 | 14.0 | 20.9
Foreign | 77.6 | 56.2 | 78.7
Total current expense | 100.9 | 67.5 | 143.8
Deferred expense (benefit): |  |  |
Federal | (77.1) | 125.8 | 81.2
State | 6.7 | 16.4 | 1.3
Foreign | 1.9 | (31.8) | (4.8)
Investment tax credit amortization | (0.3) | (0.3) | (0.3)
Total deferred expense | (68.8) | 110.1 | 77.4
Total income tax expense | $ 32.1 | $ 177.6 | $ 221.2

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