Fair value of liability classified stock options and PSU's.

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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STOCK-BASED COMPENSATION - Aggregate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based compensation
Aggregate stock-based compensation charges	$ 5.9	$ 3.8	$ 3.6
Stock Option
Stock-based compensation
Unrecognized stock-based compensation expense	$ 5.2
Weighted average period of recognition	2 years 1 month 6 days
Restricted Stock Units (RSUs)
Stock-based compensation
Unrecognized stock-based compensation expense	$ 2.4
Weighted average period of recognition	1 year 6 months
Performance Stock Units
Stock-based compensation
Unrecognized stock-based compensation expense	$ 1.6
Weighted average period of recognition	2 years 1 month 6 days
Total fair value of the liability	$ 5.5
Share-based payment liability	$ 1.1