SHARE-BASED COMPENSATION PROGRAMS - Restricted and Performance Stock Activity (Details)	12 Months Ended
Dec. 31, 2021 $ / shares shares
Holdings Restricted Stock \| Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, Beginning Balance (in shares) \| shares	2,053,036
Granted (in shares) \| shares	1,557,437
Forfeited (in shares) \| shares	(166,466)
Vested (in shares) \| shares	(1,052,916)
Unvested, Ending Balance (in shares) \| shares	2,391,091
Weighted-Average Grant Date Fair Value
Unvested, Beginning Balance, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 21.15
Granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	28.08
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	24.81
Vested, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	20.74
Unvested, Ending Balance, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 25.59
Holdings Restricted Stock \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, Beginning Balance (in shares) \| shares	557,455
Granted (in shares) \| shares	938,444
Forfeited (in shares) \| shares	(163,708)
Vested (in shares) \| shares	(141,597)
Unvested, Ending Balance (in shares) \| shares	1,190,594
Weighted-Average Grant Date Fair Value
Unvested, Beginning Balance, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 22.12
Granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	29.89
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	28.24
Vested, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	23.17
Unvested, Ending Balance, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 28.54
AXA Restricted Stock \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, Beginning Balance (in shares) \| shares	1,017,254
Granted (in shares) \| shares	(460,094)
Forfeited (in shares) \| shares	0
Vested (in shares) \| shares	(504,315)
Unvested, Ending Balance (in shares) \| shares	52,845
Weighted-Average Grant Date Fair Value
Unvested, Beginning Balance, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 21.28
Granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	21.28
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	0
Vested, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	21.28
Unvested, Ending Balance, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	$ 21.28

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

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)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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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-Publisher FASB
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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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