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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
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Nonvested Restricted Shares and Restricted Stock Units    
Balance outstanding, beginning of period, shares 5,450,191 5,364,486
Granted, shares 1,714,646 2,638,544
Vested, shares (1,425,327) (1,320,318)
Canceled, shares 0 (87,348)
Forfeited, shares (162,218) (111,212)
Balance outstanding, end of period, shares 5,577,292 6,484,152
Weighted-Average Grant Date Fair Value    
Balance outstanding, beginning of period, in dollars per share $ 17.56 $ 16.67
Granted, in dollars per share 35.15 17.14
Vested, in dollars per share 16.36 15.20
Canceled, in dollars per share 0 14.80
Forfeited, in dollars per share 22.23 15.55
Balance outstanding, end of period, in dollars per share $ 23.14 $ 17.20