Share-Based Compensation - Weighted-Average Assumptions and Resulting Grant Date Fair Value (Details) - Employee Stock Option - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Shares underlying options granted (in shares)	565	1,297
Weighted-average grant date fair value (in dollars per share)	$ 33.65	$ 42.84
Weighted-average volatility (as a percent)	32.00%	32.00%
Weighted-average expected term	4 years 7 months 6 days	4 years 6 months
Range of risk-free rates, minimum (as a percent)	0.80%	2.40%
Range of risk-free rates, maximum (as a percent)	1.60%	2.50%
Expected dividend yield (as a percent)	0.00%	0.00%