STOCK COMPENSATION PLAN - Activity Related to Time-based and Performance-based RSUs and the Grant Date Fair Value (Details)	3 Months Ended
Mar. 31, 2022 $ / shares shares
2022 Incentive Program \| 2022 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Awards granted (in shares)	3,122,400
Outstanding, end of period (in shares)	3,122,400
Weighted Average Grant Date Fair Value Per RSU
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 10.24
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 10.24
2019 Transaction Incentive Program \| 2019 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	74,600
Awards granted (in shares)	0
Awards forfeited/canceled (in shares)	(4,300)
Outstanding, end of period (in shares)	70,300
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 13.16
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share) \| $ / shares	13.16
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 13.16
LTIP Plan \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	1,872,300
Awards granted (in shares)	0
Awards vested (in shares)	(941,200)
Awards forfeited/canceled (in shares)	(67,100)
Outstanding, end of period (in shares)	864,000.0
LTIP Plan \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	588,900
Awards granted (in shares)	0
Awards vested (in shares)	(44,300)
Awards forfeited/canceled (in shares)	(187,000.0)
Outstanding, end of period (in shares)	357,600
LTIP Plan \| 2021 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	1,548,600
Awards granted (in shares)	0
Awards vested (in shares)	(751,800)
Awards forfeited/canceled (in shares)	(52,000.0)
Outstanding, end of period (in shares)	744,800
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 10.58
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards vested, weighted average grant date fair value (in dollars per share) \| $ / shares	10.59
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share) \| $ / shares	10.59
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 10.57
LTIP Plan \| 2021 \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	0
Awards granted (in shares)	0
Awards vested (in shares)	0
Awards forfeited/canceled (in shares)	0
Outstanding, end of period (in shares)	0
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards vested, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0
LTIP Plan \| 2020 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	253,900
Awards granted (in shares)	0
Awards vested (in shares)	(122,800)
Awards forfeited/canceled (in shares)	(11,900)
Outstanding, end of period (in shares)	119,200
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 14.96
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards vested, weighted average grant date fair value (in dollars per share) \| $ / shares	14.96
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share) \| $ / shares	14.96
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 14.96
LTIP Plan \| 2020 \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	377,700
Awards granted (in shares)	0
Awards vested (in shares)	0
Awards forfeited/canceled (in shares)	(20,100)
Outstanding, end of period (in shares)	357,600
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 14.96
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards vested, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share) \| $ / shares	14.96
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 14.96
LTIP Plan \| 2019 \| Time-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	69,800
Awards granted (in shares)	0
Awards vested (in shares)	(66,600)
Awards forfeited/canceled (in shares)	(3,200)
Outstanding, end of period (in shares)	0
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 22.58
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards vested, weighted average grant date fair value (in dollars per share) \| $ / shares	22.55
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share) \| $ / shares	22.55
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 0
LTIP Plan \| 2019 \| Performance-Based Restricted Stock Units (RSU) Awards
Restricted Stock Units
Outstanding, beginning of period (in shares)	211,200
Awards granted (in shares)	0
Awards vested (in shares)	(44,300)
Awards forfeited/canceled (in shares)	(166,900)
Outstanding, end of period (in shares)	0
Weighted Average Grant Date Fair Value Per RSU
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 22.55
Awards granted, weighted average grant date fair value (in dollars per share) \| $ / shares	0
Awards vested, weighted average grant date fair value (in dollars per share) \| $ / shares	22.55
Awards forfeited/canceled, weighted average grant date fair value (in dollars per share) \| $ / shares	22.55
Outstanding, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 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)	4,056,700
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)	357,600

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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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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