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Income Taxes - Current and Deferred Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current Federal Tax Expense (Benefit) |  |  |  |  |  |  |  |  | $ (1.9) | $ 0.8 | $ 0.7
Current State and Local Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (0.8) | 0.5 | 1.2
Current Foreign Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 24.9 | 22.4 | 16.7
Current Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 22.2 | 23.7 | 18.6
Deferred Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 3.7 | 22.3 | (9.8)
Income tax expense | $ 6.9 | $ 5.3 | $ 7.5 | $ 6.2 | $ 4.8 | $ 8.9 | $ 6.8 | $ 25.5 | $ 25.9 | $ 46.0 | $ 8.8

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