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Interim Financial Statements - Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Income Taxes |  |  |
Corporate tax rate (as a percent) |  | 21.00% | 35.00%
U.S. federal and state tax liability related to transition tax on repatriation of foreign earnings and profits | $ 52.2 | $ 52.2 |
Amount of deemed repatriation of foreign earnings and profits | 946.0 | 946.0 |
Income tax benefit related to remeasurement of deferred tax assets and liabilities due to change in enacted tax rate |  | 301.2 |
Adjustments to provisional estimates : |  |  |
Federal and State Change Due to Repatriation | 12.5 |  |
Other Adjustments | (0.9) |  |
Total SAB 118 Benefit | $ 11.6 |  |
Provisional estimate, income tax benefit from enactment of the Act |  | 243.4 |
Income tax benefit from enactment of the Act |  | $ 255.0 |

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- Definition Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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