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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes our stock-based compensation expense (including stock options, restricted stock units ("RSUs") and performance stock units ("PSUs")) for the three and six months ended June 30, 2023 and 2022:

		Three months ended June 30,				Six Months Ended June 30,
(in millions)		2023		2022		2023		2022
Stock option compensation expense	$	0.2	$	0.6	$	2.1	$	2.7
RSU compensation expense		1.3		0.9		3.6		3.0
PSU compensation expense		1.8		0.8		3.2		1.5
Total stock-based compensation expense	$	3.3	$	2.3	$	8.9	$	7.2

Schedule of Unrecognized Compensation Cost, Nonvested Awards

The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of June 30, 2023:

		June 30, 2023
(in millions, except weighted average years)		Unrecognized Compensation Expense		Weighted Average Years Expense To Be Recognized Over
Stock options		$1.4		1.5
RSUs		$10.2		2.4
PSUs		$6.3		2.2

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- Definition

Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (i)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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