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INVESTMENTS - NARRATIVE (Details) $ in Millions	3 Months Ended		6 Months Ended
INVESTMENTS - NARRATIVE (Details) $ in Millions	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) loan mortgage_loan	Jun. 30, 2025 USD ($)
Debt Securities, Available-for-sale [Line Items]
Value of available for sale securities sold	$ 1,136.3	$ 440.3	$ 2,793.4	$ 525.1
Amortized cost of fixed maturities that were non-income producing	5.7		5.7
Carrying value of fixed maturities that were non-income producing	3.4		3.4
Total fixed maturities, available for sale
Debt Securities, Available-for-sale [Line Items]
Gross realized losses on sales of fixed maturities, available for sale	(32.9)	$ (21.8)	$ (89.2)	$ (24.6)
Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent \| loan			40
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	1,883.0		$ 1,883.0
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	29.2		$ 29.2
Residential Portfolio Segment \| Financial Asset, Past Due \| Foreclosure
Debt Securities, Available-for-sale [Line Items]
Number of mortgage loans noncurrent \| loan			11
Carrying value of loans	5.4		$ 5.4
Total carrying amount \| Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,490.3		1,490.3
Total carrying amount \| Commercial Portfolio Segment \| Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,883.0		1,883.0
Total estimated fair value \| Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	1,502.9		1,502.9
Total estimated fair value \| Commercial Portfolio Segment \| Commercial Mortgage
Debt Securities, Available-for-sale [Line Items]
Mortgage loans	$ 1,767.9		$ 1,767.9