Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Nonvested Restricted Stock Units and Changes During the Period

Nonvested restricted stock units as of March 31, 2022, and changes during the three months ended March 31, 2022 (unaudited) were as follows:

	Shares			Weighted Average Grant-Date Fair Value
Nonvested as of December 31, 2021		355,434		$	34.40
Granted		133,787			30.82
Vested		(37,235	)		33.61
Nonvested as of March 31, 2022		451,986		$	33.41

Schedule of Stock-Based Compensation Expense

The Company's stock-based compensation expense related to the restricted stock units during the three months ended March 31, 2022 and 2021 (unaudited), respectively, which was included in General and administrative expenses within the Condensed Consolidated Statements of Income, was as follows:

	Three Months Ended
(millions)	March 31, 2022		March 31, 2021
Stock-based compensation expense	$	1.3	$	0.8

The Company's stock-based compensation expense related to PSU’s during the three months ended March 31, 2022 and 2021 (unaudited), which is included in General and administrative expenses within the Condensed Consolidated Statements of Income, was as follows:

	Three Months Ended
(millions)	March 31, 2022		March 31, 2021
Stock-based compensation expense	$	0.5	$	0.1

Summary of Nonvested PSU's and Changes During the Period

Nonvested PSU’s as of March 31, 2022, and changes during the three months ended March 31, 2022 (unaudited) were as follows:

	Shares		Weighted Average Grant-Date Fair Value
Nonvested as of December 31, 2021		135,383	$	36.79
Granted		132,710		30.80
Nonvested as of March 31, 2022		268,093	$	33.83