LIABILITIES FOR INSURANCE PRODUCTS - SCHEDULE OF INSURANCE LIABILITIES BY PRODUCT SEGMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefits	$ 11,809.1	$ 11,670.7
Policyholder account balance	$ 14,858.3	13,689.7
Long-term care
Liability for Future Policy Benefit, by Product Segment [Line Items]
Average interest rate assumption	5.00%
Future policy benefits	$ 5,292.4	5,236.1
Traditional life insurance contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Average interest rate assumption	5.00%
Future policy benefits	$ 2,695.6	2,632.4
Accident and health contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Average interest rate assumption	5.00%
Future policy benefits	$ 3,384.3	3,302.7
Interest-sensitive life insurance contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Average interest rate assumption	5.00%
Future policy benefits	$ 53.5	73.6
Policyholder account balance	$ 1,323.0	1,281.8
Annuities and supplemental contracts with life contingencies
Liability for Future Policy Benefit, by Product Segment [Line Items]
Average interest rate assumption	3.00%
Future policy benefits	$ 383.3	425.9
Fixed indexed annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Policyholder account balance	9,268.9	8,891.7
Other annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Policyholder account balance	2,855.6	3,014.2
Funding agreements
Liability for Future Policy Benefit, by Product Segment [Line Items]
Policyholder account balance	$ 1,410.8	$ 502.0