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INVESTMENTS - NARRATIVE (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) loan mortgage_loan	Jun. 30, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Value of available for sale securities sold	$ 440.3	$ 472.1	$ 525.1	$ 669.2
Amortized cost of fixed maturities that were non-income producing	5.7		5.7
Carrying value of fixed maturities that were non-income producing	3.5		$ 3.5
Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			27
Total Fixed Maturities, Available For Sale
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sale	21.8	$ 27.6	$ 24.6	$ 33.5
Amortized Cost | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,282.8		1,282.8
Fair Value | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,289.9		$ 1,289.9
Commercial Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans in process of foreclosure | mortgage_loan			0
Amortized cost	1,572.7		$ 1,572.7
Commercial Portfolio Segment | Amortized Cost | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,572.7		1,572.7
Commercial Portfolio Segment | Fair Value | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,462.7		$ 1,462.7
Residential Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | mortgage_loan			0
Residential Portfolio Segment | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Amortized cost	24.4		$ 24.4
Residential Portfolio Segment | Foreclosure | Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			6,000,000
Amortized cost	$ 3.9		$ 3.9

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