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INCOME TAXES - NARRATIVE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Carryback of net operating losses to years with a higher statutory corporate rate pursuant to provisions of the CARES Act (as defined below)	$ 0.0	$ 0.0	$ 0.0	$ (34.0)
Deferred tax assets more likely than not to be realized through future taxable earnings	$ 131.7		$ 131.7			$ 109.4
Loss limitation based on income of life insurance company, percent	35.00%		35.00%
Loss limitation based on loss of non-life entities, percent	35.00%		35.00%
Federal long-term tax exempt rate	1.64%		1.64%
Ownership change threshold restricting NOL usage	50.00%		50.00%
Net state operating loss carryforwards	$ 1.5		$ 1.5			$ 2.7
Subsequent Event
Operating Loss Carryforwards [Line Items]
Refund from the IRS related to NOL utilization provisions from the CARES Act					$ 80.0
Federal
Operating Loss Carryforwards [Line Items]
Net federal operating loss carryforwards	$ 1,400.0		$ 1,400.0
Tax Year 2018 and Beyond
Operating Loss Carryforwards [Line Items]
Acceleration of the utilization of life NOLs		375.0		375.0
Restoration of non-life NOLs		130.0		130.0
Tax Years Before 2021
Operating Loss Carryforwards [Line Items]
Acceleration of the utilization of life NOLs		105.0		105.0
Restoration of non-life NOLs		$ 35.0		$ 35.0

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