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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021 and 2020:

			Three Months Ended June 30,												Six Months Ended June 30,
(in millions)			2021						2020						2021						2020
Stock option compensation expense			$	0.6					$	0.8					$	2.3					$	1.6
RSU compensation expense			0.9						2.0						3.4						3.0
PSU compensation expense			2.7						(0.3)						3.3						(1.2)
Total stock-based compensation expense			$	4.2					$	2.5					$	9.0					$	3.4

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, 2021:

			June 30, 2021
			Unrecognized						Weighted Average
			Compensation						Years Expense To Be
(in millions, except weighted average years)			Expense						Recognized Over
Stock options			$4.6						2.2
RSUs			$5.1						1.8
PSUs			$14.0						1.9

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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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