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INVESTMENTS - NARRATIVE (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) mortgage_loan loan	Sep. 30, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Value of available for sale securities sold	$ 349.1	$ 561.1	$ 874.2	$ 1,230.3
Amortized cost of fixed maturities that were non-income producing	5.7		5.7
Carrying value of fixed maturities that were non-income producing	3.8		3.8
Total Fixed Maturities, Available For Sale
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sales of fixed maturities, available for sale	(18.1)	$ (12.8)	$ (42.7)	$ (46.3)
Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			24
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	1,674.0		$ 1,674.0
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]
Carrying value of loans	17.7		$ 17.7
Residential Portfolio Segment | Financial Asset, Past Due | Foreclosure
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent | loan			5
Carrying value of loans	3.7		$ 3.7
Total carrying amount | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,389.8		1,389.8
Total carrying amount | Commercial Portfolio Segment | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,674.0		1,674.0
Total estimated fair value | Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,366.0		1,366.0
Total estimated fair value | Commercial Portfolio Segment | Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	$ 1,577.1		$ 1,577.1

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