INCOME TAXES (SCHEDULE OF DEFERRED TAX ASSETS AND LIABILITIES) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net federal operating loss carryforwards	$ 882.9	$ 916.3
Net state operating loss carryforwards	12.3	14.1
Tax credits	0.7	55.3
Capital loss carryforwards	0.0	13.8
Investments	17.8	26.5
Insurance liabilities	668.4	600.3
Other	65.6	63.0
Gross deferred tax assets	1,647.7	1,689.3
Deferred tax liabilities:
Present value of future profits and deferred acquisition costs	(277.8)	(305.4)
Accumulated other comprehensive income	(344.1)	(223.8)
Gross deferred tax liabilities	(621.9)	(529.2)
Net deferred tax assets before valuation allowance	1,025.8	1,160.1
Valuation allowance	(240.2)	(213.5)	$ (246.0)	$ (294.8)
Net deferred tax assets	785.6	946.6
Current income taxes prepaid (accrued)	4.1	(47.8)
Income tax assets, net	$ 789.7	$ 898.8