Share-Based Compensation - Weighted-Average Assumptions and Resulting Grant Date Fair Value (Details) - Employee Stock Option - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Shares underlying options granted (in shares)	79	102	644	1,399
Weighted-average grant date fair value (in dollars per share)	$ 33.29	$ 38.95	$ 33.61	$ 42.56
Weighted-average volatility (as a percent)	36.00%	31.00%	32.00%	32.00%
Weighted-average expected term	4 years 7 months 6 days	4 years 6 months	4 years 7 months 6 days	4 years 6 months
Range of risk-free rates, minimum (as a percent)	0.30%	1.80%	0.30%	1.80%
Range of risk-free rates, maximum (as a percent)	0.40%	2.30%	1.60%	2.50%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%	0.00%