Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary of Annual Weighted-Average Assumptions

The following table summarizes the annual weighted-average assumptions for the year ended December 31, 2019:

	2019
Expected volatility		27.47	%
Risk-free interest rate		2.58	%
Expected life (years)		6.25
Expected dividend yield		0.00	%

Summary of Stock Option Awards Outstanding

Stock option awards outstanding as of December 31, 2021 and 2020, and changes during the year ended December 31, 2021, were as follows:

						Weighted-
						Average
				Weighted-		Remaining		Aggregate
	Shares Under			Average		Contractual		Intrinsic
	Option			Exercise		Term		Value
	(thousands)			Price		(years)		(millions)
Outstanding at December 31, 2020		715		$	18.91		6.3	$	0.5
Exercised		(128	)		19.13		—		1.8
Cancelled/forfeited/expired		(25	)		31.03		—		—
Outstanding at December 31, 2021		562			18.30		5.9		16.2
Vested and expected to vest at December 31, 2021		560		$	18.31		5.9	$	16.1
Exercisable at December 31, 2021		403		$	19.27		5.6	$	11.2

Summary of Nonvested Restricted Stock Unit Awards

RSUs outstanding as of December 31, 2021 and 2020, and changes during the year ended December 31, 2021, were as follows:

				Weighted-
	Shares			Average Grant
	(Thousands)			Date Fair Value
Nonvested at December 31, 2020		1,376		$	10.53
Granted		499			28.38
Vested		(653	)		10.71
Forfeited		(63	)		18.01
Nonvested at December 31, 2021		1,159		$	17.71

Summary of Nonvested Performance Share Units

PSUs outstanding as of December 31, 2021 and 2020, and changes during the year ended December 31, 2021, were as follows:

				Weighted-
	Shares			Average Grant
	(Thousands)			Date Fair Value
Nonvested at December 31, 2020		872		$	12.13
Granted		336			27.84
Vested		(244	)		15.25
Forfeited		(11	)		8.98
Nonvested at December 31, 2021		953		$	16.77

Schedule of Performance Period of Shares Award

The 2020 and 2021 PSU awards consist of four independent performance periods, including three annual performance periods and one three-year cumulative period, and one 2020 award consists of a cumulative 2021 - 2022 performance period. The performance period for the shares awarded in 2019 is January 1, 2019 through December 31, 2021.

Year Granted	Performance/ Service Period	Estimated or Actual Attainment	PSUs Outstanding as of December 31, 2021 (Thousands)		Estimated PSU Attainment or Actual PSUs Earned (Thousands)
2021	2021	200% (a)		84		168
2021	2022	(b)		77		—
2021	2023	(b)		77		—
2021	2021-2023	100% (c)		77		77
				315		245
2020	2020	138% (a)		80		110
2020	2021	200% (a)		80		160
2020	2022	(b)		80		—
2020	2020-2022	163% (c)		80		130
2020	2021 - 2022	100%		20		20
				340		420
2019	2019-2021	128% (a)		298		380

___________

(a)Amounts represent actual attainment and actual PSUs earned as the performance period is complete.

(b)As the performance period has not yet commenced, expense is not being recognized.

(c)Expense for the cumulative performance/service period is recognized at 100% of estimated attainment until the end of the second service year.