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Income Taxes Income Taxes - Repatriation of Foreign Earnings (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |
Undistributed Earnings of Foreign Subsidiaries | $ 383.5 | $ 354.7
Foreign Earnings Repatriated | $ 13.0 |

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