Employee Benefits - Summary of Equity-Based Awards for Employees (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Awards
Granted (in shares)	7,000,000	3,000,000	200,000	100,000
Common Stock Awards
Awards
Nonvested common stock awards, Beginning balance (in shares)			231,280
Granted (in shares)			55,815
Vested (in shares)			(84,254)
Forfeited/Cancelled (in shares)			(2,448)
Nonvested common stock awards, Ending balance (in shares)	200,393		200,393
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards, Beginning balance (in USD per share)			$ 48.05
Granted (in USD per share)			124.88
Vested (in USD per share)			48.81
Forfeited/Cancelled (in USD per share)			57.85
Nonvested performance-based stock awards, Ending balance (in USD per share)	$ 69.01		$ 69.01
Performance-Based Stock Awards
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)			166,961
Granted (in shares)			42,449
Vested (in shares)			(64,525)
Forfeited/Cancelled (in shares)			0
Nonvested performance-based stock awards/units, Ending balance (in shares)	144,885		144,885
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)			$ 59.97
Granted (in USD per share)			123.32
Vested (in USD per share)			52.79
Forfeited/Cancelled (in USD per share)			0
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 81.73		$ 81.73
Performance-Based Restricted Stock Units
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)			13,273
Granted (in shares)			8,470
Vested (in shares)			(12,952)
Forfeited/Cancelled (in shares)			(488)
Nonvested performance-based stock awards/units, Ending balance (in shares)	8,303		8,303
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)			$ 36.51
Granted (in USD per share)			126.89
Vested (in USD per share)			36.51
Forfeited/Cancelled (in USD per share)			67.44
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 126.89		$ 126.89