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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

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, December 31, 2019						4,006,816						$	18.18
Exercised						(1,756,471)						18.53
Forfeited						(57,744)						19.08
Expired						(6,090)						18.44
Outstanding, December 31, 2020						2,186,511						$	17.87					3.96						$	44,944,958
Exercisable, December 31, 2020						2,039,275						$	17.72					4.16						$	42,231,530

Black-Scholes Option-Pricing Model

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

Summary of Grant Date Fair Value Weighted Average Assumptions, Options

The fair value of options granted during the year ended December 31, 2018, were estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, with the following weighted average assumptions:

			Year Ended December 31, 2018
Expected life (years)			5.6
Risk-free interest rate			2.7		%
Expected volatility			26.4		%
Expected dividend yield			—

LTIP Performance Shares

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

Summary of Nonvested Performance Award Activity

A summary of the nonvested LTIP performance shares is as follows:

						Number of Shares at Expected Attainment						Weighted Average Grant Date Fair Value
Nonvested at December 31, 2019						669,469						$	20.12
Vested						(668,240)						20.12
Forfeited						(5,368)						20.12
Change in expected attainment						4,139						20.12
Nonvested at December 31, 2020						—						$	—

Restricted Share Awards (RSAs)

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

Summary of Nonvested Restricted Share Award Activity

A summary of nonvested RSAs is as follows:

						Number of Shares						Weighted Average Grant Date Fair Value
Nonvested at December 31, 2019						92,842						$	20.13
Vested						(88,913)						20.12
Forfeited						(3,929)						20.35
Nonvested at December 31, 2020						—						$	—

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 TSRs is as follows:

						Number of Shares						Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2019						1,062,291						$	35.77
Granted						677,195						30.01
Vested						(199,413)						24.37
Forfeited						(158,086)						36.69
Change in payout rate						(14,259)						24.37
Nonvested as of December 31, 2020						1,367,728						$	34.59

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 years ended December 31, 2020, 2019, and 2018, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, using the following weighted-average assumptions:

			Years Ended December 31,
			2020						2019						2018
Expected life (years)			2.8						2.8						2.9
Risk-free interest rate			0.5		%				2.5		%				2.4		%
Volatility			31.4		%				29.3		%				28.0		%
Expected dividend yield			—						—						—

Restricted Stock Units (RSUs)

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

Summary of Nonvested Restricted Share Unit Activity

A summary of nonvested RSUs is as follows:

						Number of Shares						Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2019						1,009,404						$	29.96
Granted						816,543						25.72
Vested						(431,504)						29.60
Forfeited						(276,261)						28.57
Nonvested as of December 31, 2020						1,118,182						$	27.34

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