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Income Taxes - Provisions for Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Current expense (benefit): |  |  |
Federal | $ 102.4 | $ 53.3 | $ (10.4)
State | 30.7 | 25.1 | 11.2
Foreign | 37.0 | 37.3 | 18.8
Investment tax credit | (1.6) | (1.6) | (2.9)
Total current expense | 168.5 | 114.1 | 16.7
Deferred expense (benefit): |  |  |
Federal | 61.9 | 54.6 | 81.7
State | 7.8 | (0.7) | 7.0
Foreign | (2.7) | (4.9) | 1.8
Investment tax credit amortization | (0.3) | (0.3) | (0.3)
Total deferred expense | 66.7 | 48.7 | 90.2
Total income tax expense | $ 235.2 | $ 162.8 | $ 106.9

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