BUSINESS SEGMENTS (SCHEDULE OF SELECTED FINANCIAL INFORMATION, BY SEGMENT) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Present value of future profits	$ 401.8	$ 449.0	$ 489.4	$ 679.3
Deferred acquisition costs	1,044.7	1,083.3
Insurance liabilities	22,653.8	22,143.2
Bankers Life [Member]
Segment Reporting Information [Line Items]
Present value of future profits	95.5	114.9
Deferred acquisition costs	646.2	718.2
Insurance liabilities	15,702.8	15,234.1
Washington National [Member]
Segment Reporting Information [Line Items]
Present value of future profits	266.8	290.2
Deferred acquisition costs	299.9	280.0
Insurance liabilities	5,586.7	6,126.2
Colonial Penn [Member]
Segment Reporting Information [Line Items]
Present value of future profits	39.5	43.9
Deferred acquisition costs	98.6	85.1
Insurance liabilities	809.6	$ 782.9
Long-term Care in Run-off [Member]
Segment Reporting Information [Line Items]
Present value of future profits	0.0
Deferred acquisition costs	0.0
Insurance liabilities	$ 554.7