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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation Expense Recognized (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Options [Member]
Compensation Related Costs [Abstract]
Stock-based compensation expense related to incentive and non-qualified stock options recognized	$ 2.7	$ 2.2	$ 2.6
Income tax benefit recognized	0.7	0.5	0.6
Restricted Stock [Member]
Compensation Related Costs [Abstract]
Stock-based compensation expense related to incentive and non-qualified stock options recognized	$ 3.3	$ 2.8	$ 3.2

X

- 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
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-SubTopic 10
-Section 50
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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