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Income Taxes Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Tax benefit resulting from impact of Tax Act | $ (57.7) | $ 0.0 | $ 0.0
Charge related to the Transition Tax | 32.5 |  |
Benefit from permanent rate reduction | $ 90.2 |  |

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