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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

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, 2022 and 2021:

		Three months ended June 30,								Six Months Ended June 30,
(in millions)		2022				2021				2022				2021
Stock option compensation expense	$		0.6		$		0.6		$		2.7		$		2.3
RSU compensation expense			0.9				0.9				3.0				3.4
PSU compensation expense			0.8				2.7				1.5				3.3
Total stock-based compensation expense	$		2.3		$		4.2		$		7.2		$		9.0

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, 2022:

		June 30, 2022
(in millions, except weighted average years)		Unrecognized Compensation Expense		Weighted Average Years Expense To Be Recognized Over
Stock options		$4.9		2.3
RSUs		$5.7		2.2
PSUs		$11.0		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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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