INCOME TAXES - NARRATIVE (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2008	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Loss on sale of subsidiary, gain on reinsurance transactions and transition expenses	$ 0.0	$ (32.1)	$ 9.0	$ 242.7
Deferred tax assets more likely than not to be realized through future taxable earnings	909.7		909.7				$ 799.8
Deferred Tax Assets Before Valuation Allowance	1,155.7		1,155.7				1,045.8
Valuation allowance	$ 246.0		$ 246.0				246.0
Assumed period adjusted annual taxable income will remain flat			2 years
Aggregate Growth Rate for the Next Five Years, Included in Deferred Tax Valuation Analysis	3.00%		3.00%
Valuation allowance model, forecast period of Model			5 years
Estimated normalized annual taxable income for the current year			$ 335.0
Estimated Normalized Annual Taxable Income For Current Year, Non-life Taxable Income			65.0
Estimated Normalized Annual Taxable Income For Current Year, Life Income			$ 270.0
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	2.82%		2.82%
Ownership change threshold restricting NOL usage	50.00%		50.00%
Capital Loss Carryforward	$ 42.5		$ 42.5
Net state operating loss carryforwards	14.6		14.6				$ 15.2
Loss on investment in senior health						$ 878.0
Income Tax Examination, Expired Capital Loss Carryforwards if IRS position is 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	34.0		$ 34.0
Future cash tax payments based on income of life insurance company, percent			65.00%
Internal Revenue Service [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,800.0		$ 2,800.0
Life insurance companies [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	645.8		645.8
Loss on investment in senior health						742.0
Non life insurance companies [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 2,657.8		$ 2,657.8
Loss on investment in senior health						$ 136.0
Conseco Life Insurance Company [Member]
Operating Loss Carryforwards [Line Items]
Loss on sale of subsidiary, gain on reinsurance transactions and transition expenses				$ 272.6