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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |  |  |  |
Tax benefit | $ 10.7 | $ 13.1 | $ 8.0 | $ 9.3 |
Federal income tax at statutory rate (as a percent) |  |  | 21.00% |  | 35.00%
Unrecognized tax benefits | 15.3 |  | $ 15.3 |  | $ 19.5
U.K. |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Discrete tax benefit | $ 13.2 |  |  |  |
Internal Revenue Service | Tax Years 2012 Through 2014 |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Discrete tax benefit |  | $ 13.7 |  |  |

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