STOCK COMPENSATION PLAN - Activity Related to Time-based and Performance-based RSUs and the Grant Date Fair Value (Details) - $ / shares	6 Months Ended	34 Months Ended
Jun. 30, 2022	Jun. 30, 2022
2022 Incentive Program \| 2022 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Awards granted (in shares)	3,041,900
Awards forfeited/canceled (in shares)	(22,500)
Outstanding, end of period (in shares)	3,019,400	3,019,400
Weighted Average Grant Date Fair Value Per RSU
Awards granted, weighted average grant date fair value (in dollars per share)	$ 10.24
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	10.24
Outstanding, weighted average grant date fair value (in dollars per share)	$ 10.24	$ 10.24
2019 Transaction Incentive Program \| Restricted Stock Units
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)	0
2019 Transaction Incentive Program \| 2019 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	74,600
Awards vested (in shares)	(33,300)
Awards forfeited/canceled (in shares)	(4,200)
Outstanding, end of period (in shares)	37,100	37,100
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share)	$ 13.16
Awards vested, weighted average grant date fair value (in dollars per share)	13.16
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	13.16
Outstanding, weighted average grant date fair value (in dollars per share)	$ 13.16	$ 13.16
LTIP Plan \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	1,872,300
Awards vested (in shares)	(941,200)
Awards forfeited/canceled (in shares)	(120,100)
Outstanding, end of period (in shares)	811,000.0	811,000.0
LTIP Plan \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	588,900
Awards vested (in shares)	(44,300)
Awards forfeited/canceled (in shares)	(207,800)
Outstanding, end of period (in shares)	336,800	336,800
LTIP Plan \| Restricted Stock Units
Weighted Average Grant Date Fair Value Per RSU
Accelerated vesting, number of awards (in shares)	0	57,763
LTIP Plan \| 2021 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	1,548,600
Awards vested (in shares)	(751,800)
Awards forfeited/canceled (in shares)	(98,000.0)
Outstanding, end of period (in shares)	698,800	698,800
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share)	$ 10.58
Awards vested, weighted average grant date fair value (in dollars per share)	10.59
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	10.59
Outstanding, weighted average grant date fair value (in dollars per share)	$ 10.57	$ 10.57
LTIP Plan \| 2021 \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	0
Awards vested (in shares)	0
Awards forfeited/canceled (in shares)	0
Outstanding, end of period (in shares)	0	0
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share)	$ 0
Awards vested, weighted average grant date fair value (in dollars per share)	0
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	0
Outstanding, weighted average grant date fair value (in dollars per share)	$ 0	$ 0
LTIP Plan \| 2020 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	253,900
Awards vested (in shares)	(122,800)
Awards forfeited/canceled (in shares)	(18,900)
Outstanding, end of period (in shares)	112,200	112,200
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share)	$ 14.96
Awards vested, weighted average grant date fair value (in dollars per share)	14.96
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	14.96
Outstanding, weighted average grant date fair value (in dollars per share)	$ 14.96	$ 14.96
LTIP Plan \| 2020 \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	377,700
Awards vested (in shares)	0
Awards forfeited/canceled (in shares)	(40,900)
Outstanding, end of period (in shares)	336,800	336,800
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share)	$ 14.96
Awards vested, weighted average grant date fair value (in dollars per share)	0
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	14.96
Outstanding, weighted average grant date fair value (in dollars per share)	$ 14.96	$ 14.96
LTIP Plan \| 2019 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	69,800
Awards vested (in shares)	(66,600)
Awards forfeited/canceled (in shares)	(3,200)
Outstanding, end of period (in shares)	0	0
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share)	$ 22.58
Awards vested, weighted average grant date fair value (in dollars per share)	22.55
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	22.55
Outstanding, weighted average grant date fair value (in dollars per share)	$ 0	$ 0
LTIP Plan \| 2019 \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	211,200
Awards vested (in shares)	(44,300)
Awards forfeited/canceled (in shares)	(166,900)
Outstanding, end of period (in shares)	0	0
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share)	$ 22.55
Awards vested, weighted average grant date fair value (in dollars per share)	22.55
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share)	22.55
Outstanding, weighted average grant date fair value (in dollars per share)	$ 0	$ 0
Total LTIP and TIP RSU's \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	1,946,900
Outstanding, end of period (in shares)	3,867,500	3,867,500
Total LTIP and TIP RSU's \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	588,900
Outstanding, end of period (in shares)	336,800	336,800

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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 non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares for which recognition of cost was accelerated for award under share-based payment arrangement.

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