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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

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, 2020 and 2019:

			Three Months Ended September 30,												Nine Months Ended September 30,
(in millions)			2020						2019						2020						2019
Stock option compensation expense			$	0.5					$	0.7					$	2.1					$	2.0
RSU compensation expense			1.3						1.2						4.3						4.1
PSU compensation expense			—						(1.0)						(1.2)						0.2
Total stock-based compensation expense			$	1.8					$	0.9					$	5.2					$	6.3

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, 2020:

			September 30, 2020
			Unrecognized						Weighted Average
			Compensation						Years Expense To Be
(in millions, except weighted average years)			Expense						Recognized Over
Stock options			$4.1						1.9
RSUs			$6.9						1.9
PSUs			$0.6						2.3

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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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