Share-Based Compensation - Summary of Restricted Stock and Performance Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Restricted Stock Units and Awards
Shares
Balance at beginning of period (in shares) | shares	4,797
Granted (in shares) | shares	2,410
Forfeited (in shares) | shares	(279)
Vested (in shares) | shares	(2,302)
Balance at end of period (in shares) | shares	4,626
Weighted-Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 98.29
Granted (in dollars per share) | $ / shares	104.92
Forfeited (in dollars per share) | $ / shares	104.25
Vested (in dollars per share) | $ / shares	98.94
Balance at end of period (in dollars per share) | $ / shares	$ 100.96
Performance Share Units
Shares
Balance at beginning of period (in shares) | shares	1,821
Granted (in shares) | shares	255
Forfeited (in shares) | shares	(92)
Vested (in shares) | shares	(526)
Balance at end of period (in shares) | shares	1,458
Weighted-Average Grant Date Fair Value
Balance at beginning of period (in dollars per share) | $ / shares	$ 95.20
Granted (in dollars per share) | $ / shares	108.68
Forfeited (in dollars per share) | $ / shares	97.58
Vested (in dollars per share) | $ / shares	92.72
Balance at end of period (in dollars per share) | $ / shares	$ 96.22