INCOME TAXES - NARRATIVE (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) adjustment	Jun. 30, 2015 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2015 USD ($)
Operating Loss Carryforwards [Line Items]
Deferred tax assets more likely than not to be realized through future taxable earnings	$ 726.8		$ 726.8			$ 946.6
Net deferred tax assets	913.3		913.3			1,160.1
Valuation allowance	(186.5)		(186.5)			(213.5)
Change in valuation allowance	$ (7.0)	$ 0.0	(27.0)	$ 0.0
Increase (decrease) in valuation allowance			$ (27.0)
Assumed period adjusted annual taxable income will remain flat			2 years
Deferred tax valuation analysis, growth rate for the next five years	3.00%		3.00%
Valuation allowance model, forecast period of Model			5 years
Estimated normalized annual taxable income for the current year			$ 345.0
Adjusted average non-life taxable income			85.0
Adjusted average life taxable income			$ 260.0
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	2.25%		2.25%
Ownership change threshold restricting NOL usage	50.00%		50.00%
Capital loss carryforwards	$ 4.7		$ 4.7
Net state operating loss carryforwards	13.0		13.0			$ 14.1
Loss on investment in senior health					$ 878.0
Capital loss carryforwards that would have expired if IRS position is determined to be correct			473.0
Unrecognized tax benefit related to loss on investment in Senior Health			166.0
Increase in valuation allowance if unrecognized tax benefit is recognized	42.0		$ 42.0
Number of proposed adjustments | adjustment			2
Future cash tax payments based on income of life insurance company, percent			65.00%
TCP [Member]
Operating Loss Carryforwards [Line Items]
Additional investments to be made over time			$ 11.6
Federal [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	(176.5)		(176.5)
Net operating loss carryforwards	2,400.0		2,400.0
State [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	(10.0)		(10.0)
Life insurance companies [Member]
Operating Loss Carryforwards [Line Items]
Increase (Decrease) In Estimated Normalized Annual Taxable Income For Current Year			(10.0)
Net operating loss carryforwards	354.5		354.5
Loss on investment in senior health					742.0
Non life insurance companies [Member]
Operating Loss Carryforwards [Line Items]
Increase (Decrease) In Estimated Normalized Annual Taxable Income For Current Year			10.0
Net operating loss carryforwards	$ 2,591.0		$ 2,591.0
Loss on investment in senior health					$ 136.0