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Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Stock Option Activity

A summary of stock option activity is as follows:

			Number of Shares						Weighted Average Exercise Price ($)						Weighted Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value of In-the-Money Options ($)
Outstanding as of December 31, 2020			2,186,511						$	17.87
Exercised			(144,285)						19.40
Outstanding as of March 31, 2021			2,042,226						$	17.77					3.93						$	41,422,807
Exercisable as of March 31, 2021			2,042,226						$	17.77					3.93						$	41,422,807

Total Shareholder Return Awards (TSRs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Nonvested Performance Award Activity

A summary of nonvested total shareholder return awards ("TSRs") is as follows:

			Number of Shares						Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2020			1,367,728						$	34.59
Granted			367,317						50.60
Vested			(782,588)						31.31
Forfeited			(29,405)						33.25
Change in payout rate			391,294						31.31
Nonvested as of March 31, 2021			1,314,346						$	40.07

Total Shareholder Return Awards (TSRs) | Monte Carlo Simulation Model

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Grant Date Fair Value Weighted-Average Assumptions, Awards Other Than Options

The fair value of TSRs granted during the three months ended March 31, 2021 and 2020, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, using the following weighted average assumptions:

			Three Months Ended March 31,
			2021						2020
Expected life (years)			2.8						2.8
Risk-free interest rate			0.3		%				0.5		%
Expected volatility			41.2		%				31.4		%
Expected dividend yield			—						—

Restricted Share Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Nonvested Restricted Share Unit Activity

A summary of nonvested restricted share unit awards ("RSUs") is as follows:

			Number of Shares						Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2020			1,118,182						$	27.34
Granted			480,049						39.36
Vested			(406,542)						26.73
Forfeited			(88,114)						26.84
Nonvested as of March 31, 2021			1,103,575						$	32.84

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of awards other than stock options, including, but not limited to: (a) expected term of share awards and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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