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CAPITAL STOCK AND STOCK AWARD PLANS - Stock Options Grants by First Vesting Date (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, net of forfeitures (in shares)	5,479,828
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 14.99
Unvested options (in shares)	2,791,175
First Vesting Date Dec 31 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, net of forfeitures (in shares)	1,236,538
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 12.59
Unvested options (in shares)	236,978
First Vesting Date Dec 31 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, net of forfeitures (in shares)	1,442,952
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 14.24
Unvested options (in shares)	557,792
First Vesting Date Dec 31 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, net of forfeitures (in shares)	1,155,361
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 20.11
Unvested options (in shares)	682,789
First Vesting Date Dec 31 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, net of forfeitures (in shares)	1,644,977
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 13.86
Unvested options (in shares)	1,313,616

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Net number of share options (or share units) granted during the period.

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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 (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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