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Capital Stock and Stock-Based Compensation Plans - Summary of Performance Restricted Stock Activity (Details) - Performance Shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Shares (in thousands)  
Restricted stock awards - beginning balance (in shares) | shares 346
Granted (in shares) | shares 557
Forfeited (in shares) | shares (38)
Restricted stock awards - ending balance (in shares) | shares 865
Weighted Average Grant Date Fair Value Per Award  
Restricted stock awards - beginning of period (in dollars per share) | $ / shares $ 67
Restricted stock awards - shares granted (in dollars per share) | $ / shares 76
Restricted stock awards - shares forfeited (in dollars per share) | $ / shares 69
Restricted stock awards - end of period (in dollars per share) | $ / shares $ 73