Stock-Based Compensation - Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock option activity
Total options outstanding, end of period (in shares)	7,965,501
Weighted-Average Exercise Price
Total options outstanding at the end of the period (in dollars per share)	$ 40.10
2019 LTIP
Stock option activity
Total options outstanding, end of period (in shares)	3,651,930
Weighted-Average Exercise Price
Total options outstanding at the end of the period (in dollars per share)	$ 35.13
Stock options
Stock option activity
Total options outstanding, beginning of period (in shares)	14,202,039	8,847,734	7,923,009
Granted (in shares)	1,538,250	7,494,012	3,468,626
Exercised (in shares)	(714,061)	(267,905)	(514,401)
Forfeited and cancelled (in shares)	(1,310,616)	(1,871,802)	(2,029,500)
Total options outstanding, end of period (in shares)	13,715,612	14,202,039	8,847,734
Exercisable at the end of the period (in shares)	2,507,834	1,781,153	1,772,608
Weighted-Average Exercise Price
Total options outstanding, beginning of the period (in dollars per share)	$ 42.08	$ 43.90	$ 36.21
Granted (in dollars per share)	33.44	38.41	59.66
Exercised (in dollars per share)	27.46	16.43	28.70
Forfeited and cancelled (in dollars per share)	43.72	39.67	44.64
Total options outstanding at the end of the period (in dollars per share)	41.71	42.08	43.90
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 44.93	$ 41.41	$ 35.13
Share-based compensation additional disclosures
Tax benefit from stock awards exercised	$ 1,239	$ 1,664	$ 9,347
Additional disclosures
Aggregate intrinsic value of stock options outstanding	22,277
Aggregate intrinsic value of stock options exercisable	$ 2,180
Stock options | 2019 LTIP
Stock option activity
Total options outstanding, beginning of period (in shares)	8,969,886	5,490,626
Total options outstanding, end of period (in shares)	7,965,501	8,969,886	5,490,626
Weighted-Average Exercise Price
Total options outstanding, beginning of the period (in dollars per share)	$ 40.34	$ 42.81
Total options outstanding at the end of the period (in dollars per share)	$ 40.10	$ 40.34	$ 42.81