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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2021
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]  
Common Shares Outstanding and Treasury Shares Held Rollforward Table
Common Shares OutstandingYear Ended December 31,
 202120202019
At beginning of period125,976,071 125,481,163 125,737,565 
Exercise of common stock options, net10,929 — — 
Grants of restricted stock, net (1)
950,163 494,908 (256,402)
At end of period126,937,163 125,976,071 125,481,163 
 
(1)Prior to 2019, we primarily granted restricted stock awards, which immediately impacted common shares outstanding. In contrast, during 2021, 2020 and 2019, we primarily granted restricted stock units which do not impact common shares outstanding until vesting. Vesting for restricted stock units began in 2020.
Treasury Shares HeldYear Ended December 31,
 202120202019
At beginning of period2,953,976 2,823,191 2,717,569 
Shares received upon vesting of restricted stock, net184,699 130,785 105,622 
At end of period3,138,675 2,953,976 2,823,191