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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

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 months ended March 31, 2024 and 2023:

		Three months ended March 31,
(in millions)		2024				2023
Stock option compensation expense		$	0.2			$	1.9
RSU compensation expense			3.6				2.3
PSU compensation expense			1.3				1.4
Total stock-based compensation expense		$	5.1			$	5.6

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 March 31, 2024:

		March 31, 2024
(in millions, except weighted average years)		Unrecognized Compensation Expense		Weighted Average Years Expense To Be Recognized Over
Stock options		$0.5		1.0
RSUs		$10.2		2.6
PSUs		$7.5		2.1

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- References

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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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