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INVESTMENTS - NARRATIVE (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) investment	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) mortgage_loan investment	Sep. 30, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)	$ 1.2	$ (29.3)	$ (8.2)	$ (79.2)
Gain on liquidation of variable interest entities	0.1	0.0	3.9	0.0
Change in allowance for credit losses and write-downs	$ (1.6)	2.3	$ (7.2)	13.7
Number of investments in default or considered nonperforming | investment	0		0
Value of available for sale securities sold			$ 1,230.3	527.0
Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | mortgage_loan			0
Total Fixed Maturities, Available For Sale
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale	$ 12.8	$ 9.8	$ 46.3	45.8
Embedded Derivative Related to Fixed Maturity Securities
Debt Securities, Available-for-sale [Line Items]
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives			25.2	(11.4)
Reinsurance Contract | Coinsurance
Debt Securities, Available-for-sale [Line Items]
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives			1.9	(2.5)
Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)			(49.3)	(50.5)
Equity Securities - Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)			2.9	(1.1)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			9.6	6.0
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			30.9	37.8
Various Other Investments
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			5.8	$ 2.0
Amortized Cost | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	870.6		870.6
Fair Value | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	879.5		$ 879.5
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans in process of foreclosure | mortgage_loan			0
Amortized cost	1,518.6		$ 1,518.6
Commercial Portfolio Segment | Amortized Cost | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,518.6		1,518.6
Commercial Portfolio Segment | Fair Value | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,398.1		$ 1,398.1
Residential Portfolio Segment | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | mortgage_loan			30
Amortized cost	24.6		$ 24.6
Residential Portfolio Segment | Foreclosure | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | mortgage_loan			11
Amortized cost	$ 5.8		$ 5.8

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