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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Fair value of units awarded | $ 4.7 | $ 0.4 | $ 34.8 | $ 45.7

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Fair Value + References No definition available. + Details
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