Stockholders' Equity - Capital Stock (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common stock issued, Class A
Capital Stock Activity [Roll Forward]
Beginning balance (in shares)	2,600	2,600	2,600
Ending balance (in shares)	2,600	2,600	2,600
Common stock issued, Class B
Capital Stock Activity [Roll Forward]
Beginning balance (in shares)	209,800	205,700	205,400
Shares issued under equity compensation plans (in shares)	300	400	200
Shares exchanged for common stock (in shares)		3,700	100
Ending balance (in shares)	210,100	209,800	205,700
Exchangeable shares issued, Class A
Capital Stock Activity [Roll Forward]
Beginning balance (in shares)	2,700	2,700	2,800
Shares exchanged for Class B exchangeable shares (in shares)			(100)
Ending balance (in shares)	2,700	2,700	2,700
Exchangeable shares issued, Class B
Capital Stock Activity [Roll Forward]
Beginning balance (in shares)	11,100	14,800	14,800
Shares exchanged for common stock (in shares)		(3,700)	(100)
Shares exchanged for Class B exchangeable shares (in shares)			100
Ending balance (in shares)	11,100	11,100	14,800