Share-Based Compensation - Performance-Based and Restricted Stock Awards (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
PX Performance Based Awards
Additional Company Information [Abstract]
Awards to be settled in cash (in shares)	14,000
Number of Shares (000’s)
Non-vested at beginning of period (in shares)	437,000
Granted (in shares)	188,000
Vested (in shares)	0
Cancelled and forfeited (in shares)	(15,000)
Non-vested at end of period (in shares)	610,000	437,000
Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 179.76
Granted (in dollars per share)	262.56
Vested (in dollars per share)	0
Cancelled and forfeited (in dollars per share)	221.70
Non-vested at end of period (in dollars per share)	$ 204.39	$ 179.76
Restricted Stock
Additional Company Information [Abstract]
Awards to be settled in cash (in shares)	15,000
Number of Shares (000’s)
Non-vested at beginning of period (in shares)	688,000
Granted (in shares)	175,597
Vested (in shares)	(213,000)
Cancelled and forfeited (in shares)	(15,000)
Non-vested at end of period (in shares)	636,000	688,000
Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 148.56
Granted (in dollars per share)	242.60	$ 174.95	$ 165.04
Vested (in dollars per share)	147.84
Cancelled and forfeited (in dollars per share)	206.65
Non-vested at end of period (in dollars per share)	$ 172.90	$ 148.56