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Income Taxes (Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Current: |  |  |
Current Federal Tax Expense (Benefit) | $ 25.4 | $ 28.9 | $ 3.1
Current State and Local Tax Expense (Benefit) | 4.0 | 2.0 | 0.2
Current Foreign Tax Expense (Benefit) | 0.5 | (0.1) | 0.0
Current Income Tax Expense (Benefit) | 29.9 | 30.8 | 3.3
Deferred: |  |  |
Deferred Federal Income Tax Expense (Benefit) | (4.3) | (9.8) | 2.8
Deferred State and Local Income Tax Expense (Benefit) | (0.2) | 3.4 | 2.7
Deferred Foreign Income Tax Expense (Benefit) | (1.2) | (0.2) | (0.5)
Deferred Income Tax Expense (Benefit) | (5.7) | (6.6) | 5.0
Income tax expense (benefit) | $ 24.2 | $ 24.2 | $ 8.3

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