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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Effective tax rate (as a percent) | 22.90% | 21.30% |
Statutory Federal income tax rate (as a percent) | 21.00% | 21.00% |
Capital loss carryforward valuation allowance | $ 0.9 | $ 0.9 |
Revaluation of net deferred tax liabilities for the Tax Act |  |  | $ 246.8
Alternative minimum tax credits |  |  | $ 13.9
Accounting Standards Update 2016-09 |  |  |
Discrete tax benefit |  | $ 4.3 |

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- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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