INCOME TAXES (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Tax Expense (Benefit) [Abstract]
Current tax expense	$ 3.4	$ 1.8	$ 6.7	$ 4.9
Deferred tax provision	35.4	23.6	65.3	45.5
Total income tax expense	38.8	25.4	72.0	50.4
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
U.S. statutory corporate rate			35.00%	35.00%
Other nondeductible benefits			1.20%	(0.40%)
State taxes			0.90%	0.70%
Provision for tax issues, tax credits and other			(0.50%)	0.10%
Effective tax rate			36.60%	35.40%
Components of Deferred Tax Assets [Abstract]
Net federal operating loss carryforwards	1,374.6		1,374.6		1,445.2
Net state operating loss carryforwards	16.4		16.4		16.8
Tax credits	36.7		36.7		32.6
Capital loss carryforwards	319.8		319.8		342.3
Insurance liabilities	763.3		763.3		744.4
Other	50.5		50.5		64.8
Gross deferred tax assets	2,561.3		2,561.3		2,646.1
Deferred tax liabilities:
Investments	(28.3)		(28.3)		(24.2)
Present value of future profits and deferred acquisition costs	(339.7)		(339.7)		(363.7)
Unrealized appreciation on investments	(552.9)		(552.9)		(434.8)
Gross deferred tax liabilities	(920.9)		(920.9)		(822.7)
Net deferred tax assets before valuation allowance	1,640.4		1,640.4		1,823.4
Valuation allowance	(938.4)		(938.4)		(938.4)
Net deferred tax assets	702.0		702.0		885.0
Current income taxes accrued	(22.3)		(22.3)		(19.6)
Income tax assets, net	$ 679.7		$ 679.7		$ 865.4
Loss Limitation Based On Income Of Life Insurance Company	35.00%		35.00%
Loss Limitation Based On Loss Of Non Life Entities	35.00%		35.00%
Debenture Interest Rate	7.00%		7.00%
Federal Long Term Tax Exempt Rate	3.26%		3.26%
Ownership Change Threshold Restricting Nol Useage	50.00%		50.00%