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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) investment	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) investment	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Variable Interest Entity [Line Items]
Interest expense	$ 55.3	$ 59.1	$ 106.2	$ 121.1
Variable interest entities net realized gain (losses) on investments			(2.1)	(3.3)
Net losses from the sales of fixed maturities			(1.1)	(4.3)
Variable interest entities, change in allowance for credit losses			1.0	1.0
Variable interest entity, gross investment losses from sale			1.1	3.5
Variable interest entities, investments sold			$ 14.4	54.5
Number of investments held by VIE, in default \| investment	0		0
Less than 12 months	$ 4,900.2		$ 4,900.2		$ 1,864.0
Gross unrealized losses of investments in unrealized loss position for less than 12 months	98.6		98.6		58.5
12 months or greater	4,801.9		4,801.9		5,964.9
Gross unrealized losses of investments in unrealized loss position for more than 12 months	797.5		797.5		836.7
Investments held in limited partnerships	789.3		789.3
Unfunded commitments to limited partnerships	692.6		692.6
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Interest expense			7.8	$ 13.7
Less than 12 months	71.8		71.8		86.7
Gross unrealized losses of investments in unrealized loss position for less than 12 months	0.9		0.9		0.9
12 months or greater	76.1		76.1		34.2
Gross unrealized losses of investments in unrealized loss position for more than 12 months	0.9		0.9		$ 0.3
Variable Interest Entity, Primary Beneficiary \| Non Investment Grade
Variable Interest Entity [Line Items]
Total amortized cost	296.2		296.2
Variable interest entity, gross unrealized gains fixed maturity securities	0.6		0.6
Variable interest entity gross unrealized losses fixed maturity securities	2.9		2.9
Variable interest entity, allowance for credit losses fixed maturity securities	1.6		1.6
Variable Interest Entity, Not Primary Beneficiary \| Non Investment Grade
Variable Interest Entity [Line Items]
Estimated fair value of fixed maturity securities	$ 292.3		$ 292.3