STOCK COMPENSATION PLAN - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares reserved for issuance (in shares)	6,565,000
Shares remaining available for grants (in shares)	2,700,000
Term of plan	7 years
Time-Based LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense \| $	$ 0.1
Deferred stock-based compensation \| $	$ 6.1
Number of awards vested (in shares)	193,200
Performance-Based LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense \| $	$ 0.1
Deferred stock-based compensation \| $	$ 7.3
Number of awards vested (in shares)	0
2018 Long Term Incentive Program \| Time-based and Performance-based RSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	0
2018 Long Term Incentive Program \| Time-Based LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2018 Long Term Incentive Program \| Performance-Based LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2017 Long Term Incentive Program \| Performance-Based LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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