INCOME TAXES - NARRATIVE (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2010	Dec. 31, 2009	Jan. 30, 2009 right
Operating Loss Carryforwards [Line Items]
Tax reform provisional income tax expense (benefit)				$ 172,500,000
Deferred tax valuation analysis, growth rate for the next five years	3.50%	3.50%
Deferred tax assets	$ 428,900,000	$ 428,900,000	$ 798,400,000
Change in valuation allowance	(193,700,000)	(193,700,000)	104,600,000	(166,800,000)
Valuation allowance	$ 0	$ 0	193,700,000	$ 89,100,000	$ 255,900,000	$ 240,200,000
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	1.59%	1.59%
Ownership change threshold restricting NOL usage	50.00%	50.00%
Ownership percentage threshold relating to company 382 provision, ownership percentage at which transfers of common stock become void (less than)							5.00%	5.00%
Number of rights for each share | right									1
Ownership percentage threshold relating to company 382 securities									4.99%
Net operating loss carryforwards	$ 2,534,500,000	$ 2,534,500,000
Net state operating loss carryforwards	10,300,000	10,300,000	14,500,000
Unrecognized tax benefits	0	0	0
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,500,000,000	2,500,000,000
No Expiration
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 523,600,000	$ 523,600,000
Long-term Care Reinsurance
Operating Loss Carryforwards [Line Items]
Change in valuation allowance			104,800,000
Other Changes
Operating Loss Carryforwards [Line Items]
Change in valuation allowance			$ (200,000)