Long-Term Incentive Plans - Summary of activity related to restricted stock awards (Details) - Restricted stock	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number of Shares/Units
Beginning balance (in shares) | shares	1,102,390
Granted (in shares) | shares	646,844
Vested (in shares) | shares	(15,630)
Forfeited/Cancelled (in shares) | shares	(46,061)
Ending balance (in shares) | shares	1,687,543
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars of shares) | $ / shares	$ 377.32
Granted (in dollars of shares) | $ / shares	496.44
Vested (in dollars of shares) | $ / shares	526.62
Forfeited/Cancelled (in dollars of shares) | $ / shares	377.85
Ending balance (in dollars of shares) | $ / shares	$ 421.58