Share-Based Compensation - Summary of Restricted Stock and Performance Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Restricted Stock Units
Shares
Balance at beginning of period (in shares) | shares	6,869
Granted (in shares) | shares	1,174
Forfeited (in shares) | shares	(64)
Vested (in shares) | shares	(2,418)
Balance at end of period (in shares) | shares	5,561
Weighted-Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 93.80
Granted (in dollars per share) | $ / shares	113.00
Forfeited (in dollars per share) | $ / shares	86.60
Vested (in dollars per share) | $ / shares	95.53
Balance at end of period (in dollars per share) | $ / shares	$ 97.18
Performance Share Units
Shares
Balance at beginning of period (in shares) | shares	2,328
Granted (in shares) | shares	0
Forfeited (in shares) | shares	(16)
Vested (in shares) | shares	(175)
Balance at end of period (in shares) | shares	2,137
Weighted-Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 94.61
Granted (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	91.60
Vested (in dollars per share) | $ / shares	75.92
Balance at end of period (in dollars per share) | $ / shares	$ 96.17
Restricted Stock Awards
Shares
Balance at beginning of period (in shares) | shares	48
Granted (in shares) | shares	0
Forfeited (in shares) | shares	0
Vested (in shares) | shares	0
Balance at end of period (in shares) | shares	48
Weighted-Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 102.30
Granted (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	0
Balance at end of period (in dollars per share) | $ / shares	$ 102.30