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Income Taxes - Provisions for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Current expense (benefit): |  |  |
Federal | $ 51.7 | $ (2.7) | $ (2.7)
State | 14.0 | 26.0 | 14.0
Foreign | 69.6 | 77.6 | 56.2
Total current expense | 135.3 | 100.9 | 67.5
Deferred expense (benefit): |  |  |
Federal | 2.9 | (77.1) | 125.8
State | 3.5 | 6.7 | 16.4
Foreign | (48.8) | 1.9 | (31.8)
Investment tax credit amortization | (0.3) | (0.3) | (0.3)
Total deferred expense | (42.7) | (68.8) | 110.1
Total income tax expense | $ 92.6 | $ 32.1 | $ 177.6

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