Share-Based Compensation - Summary of Restricted Stock and Performance Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Restricted Stock Units
Shares
Balance at beginning of period (in shares) | shares	6,869
Granted (in shares) | shares	1,336
Forfeited (in shares) | shares	(220)
Vested (in shares) | shares	(3,227)
Balance at end of period (in shares) | shares	4,758
Weighted-Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 93.80
Granted (in dollars per share) | $ / shares	111.71
Forfeited (in dollars per share) | $ / shares	92.28
Vested (in dollars per share) | $ / shares	95.84
Balance at end of period (in dollars per share) | $ / shares	$ 97.46
Performance Share Units
Shares
Balance at beginning of period (in shares) | shares	2,328
Granted (in shares) | shares	0
Forfeited (in shares) | shares	(28)
Vested (in shares) | shares	(479)
Balance at end of period (in shares) | shares	1,821
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	90.44
Vested (in dollars per share) | $ / shares	92.62
Balance at end of period (in dollars per share) | $ / shares	$ 95.20
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