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Income Taxes - (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
U.S. federal statutory tax rate (as a percent) |  |  | 21.00% | 35.00%
Effective income tax rate (as a percent) | 28.10% | 28.30% |  |
ASU 2016-09 |  |  |  |
Excess tax benefits from employee stock compensation benefit | $ 1.5 | $ 4.6 |  |
Effective income tax rate (as a percent) | 13.90% | 32.90% |  |
Net aggregate increase in valuation allowance |  | $ 5.3 |  |

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