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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Effective tax rate (as a percent) | 24.50% | 22.60% |
Statutory Federal income tax rate (as a percent) | 21.00% | 21.00% |
Capital loss carryforward valuation allowance |  | $ 0.9 |
Revaluation of net deferred tax liabilities for the Tax Act |  |  | $ 246.8
Alternative minimum tax credits | $ 13.9 | 13.9 |
Accounting Standards Update 2016-09 |  |  |
Discrete tax benefit |  | $ 4.6 |

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