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Income Taxes - Tax Reform (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |  |
Statutory tax rate |  | 21.00% | 21.00% | 35.00%
Percentage of tax reform enacted |  | 15.50% |  |
Percentage of tax reform enacted remaining earnings |  | 8.00% |  |
Income tax expense on foreign earnings deemed repatriated |  |  |  | $ 18.2
Tax liability for repatriation tax |  |  | $ 10.1 |
Repatriation tax, period for payment |  |  | 8 years |
Deferred tax expense for foreign taxes on distributions from foreign subsidiaries deemed repatriated | $ 7.3 |  | $ 0.0 |
Provisional tax expense for remeasurement of net deferred tax assets |  |  | 2.3 |
Reduction of provisional taxes payable |  | $ 0.5 | $ 2.5 |

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