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Stock and Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of stock-based compensation expense by type of award

The following table summarizes our stock-based compensation expense by type of award (in millions):

			Year Ended December 31,
			2023						2022						2021
PRSUs			$	4.1					$	3.4					$	1.6
RSUs			9.0						8.0						5.0
Service options			0.7						0.9						1.0
Market options			2.7						4.3						5.6
Total stock-based compensation expense			$	16.5					$	16.6					$	13.2

PRSUs

Stock and Stock-Based Compensation Plans

Summary of PRSU activity

The following table summarizes PRSU activity, including dividend equivalents, under the Omnibus Plan for the year ended December 31, 2023:

Performance-Based Restricted Stock Units						Number						Weighted Average Grant Date Fair Value
PRSUs at January 1, 2023						1,456,736						$	18.24
Granted						540,752						16.09
Vested						—						N/A
Forfeited						(418,893)						22.25
PRSUs at December 31, 2023						1,578,595						$	16.44

RSUs

Stock and Stock-Based Compensation Plans

Summary of RSU activity

The following table summarizes RSU activity, including dividend equivalents, under the Omnibus Plan for the year ended December 31, 2023:

Restricted Stock Units						Number						Weighted Average Grant Date Fair Value
RSUs at January 1, 2023						1,365,882						$	14.88
Granted						606,728						14.19
Vested						(544,191)						15.56
Forfeited						(78,543)						15.23
RSUs at December 31, 2023						1,349,876						$	14.27

Service options

Stock and Stock-Based Compensation Plans

Summary of option activity

The following table summarizes service option activity under the Omnibus Plan for the year ended December 31, 2023:

Service Options			Number						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2023			1,286,097						$	14.71
Granted			53,222						14.83
Exercised			(156,752)						11.31
Forfeited			—						N/A
Canceled			(19,293)						14.05
Outstanding at December 31, 2023			1,163,274						$	15.18					6.1 years						$	1.1
Exercisable at December 31, 2023			665,409						$	14.64					5.0 years						$	0.9

Market Options

Stock and Stock-Based Compensation Plans

Summary of option activity

The following table summarizes market option activity under the Omnibus Plan for the year ended December 31, 2023:

Market Options			Number						Weighted Average Exercise Price						Weighted Average Remaining Contractual Term						Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2023			3,557,134						$	16.09
Granted			212,886						14.83
Exercised			—						N/A
Forfeited			—						N/A
Canceled			—						N/A
Outstanding at December 31, 2023			3,770,020						$	16.02					7.5 years						$	1.5
Exercisable at December 31, 2023			—						N/A						N/A						N/A

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