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FAIR VALUE MEASUREMENTS - FAIR VALUE ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS, UNOBSERVABLE INPUT RECONCILIATION - ACTIVITY (Details) - Significant unobservable inputs  (Level 3) - Fair value, Measurements, Recurring - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Corporate securities
Assets:
Purchases	$ 44.0	$ 27.7
Sales	(30.1)	(1.4)
Issuances	0.0	0.0
Settlements	0.0	0.0
Purchases, sales, issuances and settlements, net	13.9	26.3
Asset-backed securities
Assets:
Purchases	16.4	0.0
Sales	(17.1)	(6.3)
Issuances	0.0	0.0
Settlements	0.0	0.0
Purchases, sales, issuances and settlements, net	(0.7)	(6.3)
Collateralized loan obligations
Assets:
Purchases	4.0	0.0
Sales	0.0	0.0
Issuances	0.0	0.0
Settlements	0.0	0.0
Purchases, sales, issuances and settlements, net	4.0	0.0
Total fixed maturities, available for sale
Assets:
Purchases	64.4	27.7
Sales	(47.2)	(7.7)
Issuances	0.0	0.0
Settlements	0.0	0.0
Purchases, sales, issuances and settlements, net	17.2	20.0
Equity securities - corporate securities
Assets:
Purchases	0.0	0.0
Sales	0.0	(2.1)
Issuances	0.0	0.0
Settlements	0.0	0.0
Purchases, sales, issuances and settlements, net	0.0	(2.1)
Other invested assets - residual tranches
Assets:
Purchases	44.5	13.5
Sales	(7.2)	(0.4)
Issuances	0.0	0.0
Settlements	0.0	0.0
Purchases, sales, issuances and settlements, net	$ 37.3	$ 13.1

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