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Share-Based Payments, Deferred Compensation and Employee Ownership Plans - Restricted Stock Units Rollforward (Details) - Equity Plans - Restricted Shares and Restricted Stock Units (RSUs) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Nonvested Restricted Shares and Restricted Stock Units    
Balance outstanding, beginning of period, shares 5,450,191 5,364,486
Granted, shares 1,593,941 2,140,932
Vested, shares (291,062) (640,084)
Canceled, shares 0 (87,348)
Forfeited, shares (8,134) (30,562)
Balance outstanding, end of period, shares 6,744,936 6,747,424
Weighted-Average Grant Date Fair Value    
Balance outstanding, beginning of period, in dollars per share $ 17.56 $ 16.67
Granted, in dollars per share 34.85 17.39
Vested, in dollars per share 16.11 14.63
Canceled, in dollars per share 0 14.80
Forfeited, in dollars per share 20.22 15.86
Balance outstanding, end of period, in dollars per share $ 21.71 $ 17.12