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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Company contributions	$ 59.8	$ 35.9	$ 28.9
Deferred compensation plan amounts owed, non current	60.8	59.5
Deferred compensation plan amounts owed	$ 62.9	$ 61.5

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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