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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2023 and 2022:

		Three months ended September 30,				Nine Months Ended September 30,
(in millions)		2023		2022		2023		2022
Stock option compensation expense	$	0.3	$	0.4	$	2.4	$	3.1
RSU compensation expense		1.3		0.8		4.9		3.8
PSU compensation expense		(0.1)		(0.6)		3.1		0.9
Total stock-based compensation expense	$	1.5	$	0.6	$	10.4	$	7.8

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 September 30, 2023:

		September 30, 2023
(in millions, except weighted average years)		Unrecognized Compensation Expense		Weighted Average Years Expense To Be Recognized Over
Stock options		$1.1		1.2
RSUs		$9.1		2.2
PSUs		$4.2		2.1

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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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