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Capital Stock and Share-Based Compensation Plans - Restricted stock and restricted stock unit activity (Details) - Restricted stock units - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Unvested shares at beginning of period, number of shares 3,048,285 2,385,496 2,191,659  
Shares and units awarded in period, number of shares 1,938,617 1,867,083 1,375,565  
Shares and units vested in period, number of shares (1,224,417) (1,147,220) (1,060,685)  
Shares and units forfeited in period, number of shares (46,570) (57,074) (121,043)  
Unvested shares at end of period, number of shares 3,715,915 3,048,285 2,385,496  
Weighted Average        
Unvested shares at beginning of period, weighted-average value (USD per share) $ 13.11 $ 18.57 $ 17.25 $ 12.22
Shares and units awarded in period, weighted-average value (USD per share) 8.46 19.19 22.63  
Shares and units vested in period, weighted-average value (USD per share) 11.61 21.20 20.32  
Shares and units forfeited in period, weighted-average value (USD per share) 15.26 20.07 16.19  
Unvested shares at end of period, weighted-average value (USD per share) $ 13.11 $ 18.57 $ 17.25  
Range of Prices        
Unvested shares and units, range of exercise prices, beginning of period, lower range (USD per share) 9 9 7  
Unvested shares and units, range of exercise prices, beginning of period, upper range (USD per share) 23 23 23  
Shares and units awarded in period, range of exercise prices, lower range (USD per share) 7 14 14  
Shares and units awarded in period, range of exercise prices, upper range (USD per share) 8 22 23  
Shares and units vested in period, range of exercise prices, lower range (USD per share) $ 5 $ 11 $ 15  
Shares and units vested in period, range of exercise prices, upper range (USD per share) $ 15 $ 22 $ 24  
Shares and units forfeited in period, range of exercise prices, lower range (USD per share) 8 9 9  
Shares and units forfeited in period, range of exercise prices, upper range (USD per share) 23 23 23  
Unvested shares and units, range of exercise prices, end of period, lower range (USD per share) 7 9 9  
Unvested shares and units, range of exercise prices, end of period, upper range (USD per share) 23 23 23