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Stock-Based Compensation Plans - Summary of Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Number of Shares  
Outstanding, beginning balance (in shares) | shares 4,006,816
Exercised (in shares) | shares (1,756,471)
Forfeited (in shares) | shares (57,744)
Expired (in shares) | shares (6,090)
Outstanding, ending balance (in shares) | shares 2,186,511
Exercisable, ending balance (in shares) | shares 2,039,275
Weighted Average Exercise Price  
Beginning balance (in dollars per share) | $ / shares $ 18.18
Exercised (in dollars per share) | $ / shares 18.53
Forfeited (in dollars per share) | $ / shares 19.08
Expired (in dollars per share) | $ / shares 18.44
Ending balance (in dollars per share) | $ / shares 17.87
Weighted average exercise price, exercisable, ending balance (in dollars per share) | $ / shares $ 17.72
Weighted Average Remaining Contractual Term (Years)  
Weighted average remaining contractual term, outstanding, end of period (in years) 3 years 11 months 15 days
Weighted average remaining contractual term, exercisable, end of period (in years) 4 years 1 month 28 days
Aggregate Intrinsic Value of In-the-Money Options  
Aggregate intrinsic value of in-the-money options, outstanding, end of period | $ $ 44,944,958
Aggregate intrinsic value of in-the-money options, exercisable, end of period | $ $ 42,231,530