LIABILITIES FOR INSURANCE PRODUCTS (SCHEDULE OF INSURANCE LIABILITIES BY PRODUCT SEGMENT) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	$ 11,082.4	$ 11,521.3
Policyholder account balance	$ 11,594.1	11,220.7
Long-term care
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest rate assumption	6.00%
Future policy benefits	$ 5,277.9	5,669.0
Traditional life insurance contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest rate assumption	5.00%
Future policy benefits	$ 2,461.6	2,401.2
Accident and health contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest rate assumption	5.00%
Future policy benefits	$ 2,944.5	2,812.0
Interest-sensitive life insurance contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest rate assumption	5.00%
Future policy benefits	$ 30.3	44.9
Policyholder account balance	$ 1,142.5	1,094.7
Annuities and supplemental contracts with life contingencies
Liability for Future Policy Benefit, by Product Segment [Line Items]
Interest rate assumption	4.00%
Future policy benefits	$ 368.1	594.2
Fixed index annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Policyholder account balance	6,657.8	5,942.2
Other annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Policyholder account balance	$ 3,793.8	$ 4,183.8