Share-Based Compensation - Summary of Restricted Stock and Performance Activity (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Restricted Stock Units
Shares
Balance at beginning of period (in shares) | shares	6,869
Granted (in shares) | shares	1,298
Forfeited (in shares) | shares	(151)
Vested (in shares) | shares	(2,707)
Balance at end of period (in shares) | shares	5,309
Weighted-Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 93.80
Granted (in dollars per share) | $ / shares	112.02
Forfeited (in dollars per share) | $ / shares	89.30
Vested (in dollars per share) | $ / shares	95.16
Balance at end of period (in dollars per share) | $ / shares	$ 97.64
Performance Share Units
Shares
Balance at beginning of period (in shares) | shares	2,328
Granted (in shares) | shares	0
Forfeited (in shares) | shares	(27)
Vested (in shares) | shares	(175)
Balance at end of period (in shares) | shares	2,126
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	90.32
Vested (in dollars per share) | $ / shares	75.92
Balance at end of period (in dollars per share) | $ / shares	$ 96.21
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