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Income Taxes (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Effective tax rate |  |  |  |  |  |
Effective income tax rate (as a percent) |  | 22.02% | 26.71% | 23.73% | 27.52% |
Effect of Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |
Federal statutory tax rate |  |  |  | 21.00% |  | 35.00%
Provisional increase to deferred tax expense | $ 261.3 |  |  |  |  |

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