Stock-Based Compensation Plans - Summary of Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Number of Shares
Outstanding, beginning balance (in shares) | shares	4,006,816
Exercised (in shares) | shares	(1,110,583)
Forfeited (in shares) | shares	(57,744)
Expired (in shares) | shares	(6,090)
Outstanding, ending balance (in shares) | shares	2,832,399
Exercisable, ending balance (in shares) | shares	2,685,163
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 18.18
Exercised (in dollars per share) | $ / shares	19.58
Forfeited (in dollars per share) | $ / shares	19.08
Expired (in dollars per share) | $ / shares	18.44
Ending balance (in dollars per share) | $ / shares	17.61
Weighted average exercise price, exercisable, ending balance (in dollars per share) | $ / shares	$ 17.48
Weighted Average Remaining Contractual Term (Years)
Weighted average remaining contractual term, outstanding, end of period (in years)	3 years 11 months 23 days
Weighted average remaining contractual term, exercisable, end of period (in years)	4 years 1 month 9 days
Aggregate Intrinsic Value of In-the-Money Options
Aggregate intrinsic value of in-the-money options, outstanding, end of period | $	$ 26,562,039
Aggregate intrinsic value of in-the-money options, exercisable, end of period | $	$ 25,532,991