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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement [Abstract] |  |
Fair value of units awarded | $ 45.2 | $ 30.1

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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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