Capital Stock - Narrative (Details)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2021 shares	Dec. 31, 2020 shares	Dec. 31, 2019 shares
Class of Stock [Line Items]
Stock split	3
Common stock authorized (in shares)		900,000,000
Preferred stock authorized (in shares)		90,000,000
Common stock reserved for exercise and future grants of restricted stock (in shares)		19,135,222	21,007,911	24,776,304
Common stock held in revocable trust (in shares)		1,426,883	1,469,712	1,469,349
2006 Employee Plan
Class of Stock [Line Items]
Common shares issuable or transferable (in shares)		71,100,000
Cumulative Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized (in shares)		9,000,000
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized (in shares)		3,000,000