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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Provision (benefit) for income taxes, as a percentage of income before income taxes | 57.60% | 0.00% | 68.80% | 38.20% |
Liability related to unrecognized tax benefits | $ 2.2 |  | $ 2.2 |  | $ 4.6

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