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INVESTMENTS - NARRATIVE (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) investment	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loan mortgage_loan investment	Sep. 30, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)	$ (29.3)	$ (17.7)	$ (79.2)	$ (99.2)
Change in allowance for credit losses	$ 2.3	(7.5)	$ 13.7	46.9
Number of investments in default or considered nonperforming | investment	0		0
Value of available for sale securities sold			$ 527.0	1,321.7
Total fixed maturities, available for sale
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale	$ 9.8	$ 24.4	45.8	81.3
Embedded Derivative Related to Fixed Maturity Securities
Debt Securities, Available-for-sale [Line Items]
Change in fair value of certain investments with embedded derivatives			(11.4)	(37.4)
Reinsurance Contract | Coinsurance
Debt Securities, Available-for-sale [Line Items]
Change in fair value of certain investments with embedded derivatives			(2.5)	(16.1)
Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)			(50.5)	11.9
Equity Securities - Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)			(1.1)	(10.7)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			6.0
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			37.8	54.3
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale				14.0
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale				7.3
Various Other Investments
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			2.0	$ 5.7
Carrying Value | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	571.6		571.6
Fair Value | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	572.4		$ 572.4
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans in process of foreclosure | mortgage_loan			0
Carrying value of loans	1,410.6		$ 1,410.6
Commercial Portfolio Segment | Carrying Value | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,410.6		1,410.6
Commercial Portfolio Segment | Fair Value | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,217.8		$ 1,217.8
Residential Portfolio Segment | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			5
Carrying value of loans	2.3		$ 2.3
Residential Portfolio Segment | Foreclosure | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			4
Carrying value of loans	$ 2.0		$ 2.0

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