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

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- References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Fair Value

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No definition available.

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