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INVESTMENTS - NARRATIVE (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) investment	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) loan investment mortgage_loan	Jun. 30, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)	$ (17.2)	$ (35.3)	$ (9.4)	$ (49.9)
Gain on liquidation of variable interest entity	0.0	0.0	3.8	0.0
Change in allowance for credit losses	$ (4.1)	9.9	$ (5.6)	11.4
Number of investments in default or considered nonperforming | investment	0		0
Value of available for sale securities sold			$ 669.2	388.8
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	$ 27.6	$ 21.6	$ 33.5	36.0
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			17.1	(2.2)
Reinsurance Contract | Coinsurance
Debt Securities, Available-for-sale [Line Items]
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives			0.2	(0.3)
Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)			(36.2)	(35.8)
Equity Securities - Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Net realized investment gains (losses)			0.1	(0.2)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			9.2	4.3
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			19.8	29.8
Various Other Investments
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale			4.5	$ 1.9
Amortized Cost | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	702.0		702.0
Fair Value | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	704.9		$ 704.9
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans in process of foreclosure | mortgage_loan			0
Amortized cost	1,487.2		$ 1,487.2
Commercial Portfolio Segment | Amortized Cost | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,487.2		1,487.2
Commercial Portfolio Segment | Fair Value | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,315.6		$ 1,315.6
Residential Portfolio Segment | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			23
Amortized cost	14.3		$ 14.3
Residential Portfolio Segment | Foreclosure | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			15
Amortized cost	$ 6.6		$ 6.6

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