STOCK COMPENSATION PLAN - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($) shares	Jun. 30, 2019 USD ($) shares
Share-based Payment Arrangement [Abstract]
Shares reserved for issuance (in shares)	6,565,000	6,565,000
Shares remaining available for grants (in shares)	1,900,000	1,900,000
Term of plan		7 years
Time-Based LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)		442,200
Allocated share-based compensation expense \| $		$ 1.3
Deferred stock-based compensation \| $	$ 14.5	$ 14.5
Number of awards vested (in shares)		200,200
Performance-Based LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)		442,200
Allocated share-based compensation expense \| $		$ 1.0
Deferred stock-based compensation \| $	$ 15.8	$ 15.8
Number of awards vested (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 \| Time-based and Performance-based RSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	884,412

Allocated Share-based Compensation Expense, Cumulative Adjustment

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Stock Compensation Plan, Term

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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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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