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Stock-Based Compensation Plans - Summary of Nonvested RSUs (Details) - Restricted Share Units (RSUs)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Number of Shares  
Nonvested, beginning balance (in shares) | shares 1,118,182
Granted (in shares) | shares 480,049
Vested (in shares) | shares (406,542)
Forfeited (in shares) | shares (88,114)
Nonvested, ending balance (in shares) | shares 1,103,575
Weighted Average Grant Date Fair Value  
Nonvested, beginning balance (in dollars per share) | $ / shares $ 27.34
Granted (in dollars per share) | $ / shares 39.36
Vested (in dollars per share) | $ / shares 26.73
Forfeited (in dollars per share) | $ / shares 26.84
Nonvested, ending balance (in dollars per share) | $ / shares $ 32.84