Capital Stock - Narrative (Details) - shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock authorized (in shares)	900,000,000
Preferred stock authorized (in shares)	30,000,000
Common stock reserved for exercise and future grants of restricted stock (in shares)	17,939,143	19,135,222	21,007,911
Common stock held in revocable trust (in shares)	1,426,883	1,426,883	1,469,712
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)	3,000,000