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INVESTMENTS - SCHEDULE OF AMORTIZED COST, GROSS UNREALIZED GAINS AND LOSSES, ESTIMATED FAIR VALUE, AND ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 26,081.4
Allowance for credit losses	(43.9)	$ (36.0)	$ (38.9)	$ (37.1)
Estimated fair value	23,881.1	23,886.8
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	14,558.6	14,568.8
Gross unrealized gains	39.6	137.1
Gross unrealized losses	(1,578.6)	(1,413.2)
Allowance for credit losses	(37.8)	(30.2)	$ (33.1)	$ (31.1)
Estimated fair value	12,981.8	13,262.5
United States Treasury securities and obligations of United States government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	208.9	207.2
Gross unrealized gains	0.0	0.1
Gross unrealized losses	(32.5)	(30.2)
Allowance for credit losses	0.0	0.0
Estimated fair value	176.4	177.1
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,250.8	3,311.4
Gross unrealized gains	21.4	25.1
Gross unrealized losses	(390.2)	(378.9)
Allowance for credit losses	(2.8)	(2.9)
Estimated fair value	2,879.2	2,954.7
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	134.8	130.9
Gross unrealized gains	0.4	0.9
Gross unrealized losses	(13.4)	(10.7)
Allowance for credit losses	(1.0)	(0.6)
Estimated fair value	120.8	120.5
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,844.1	1,780.8
Gross unrealized gains	7.8	14.0
Gross unrealized losses	(51.4)	(47.4)
Allowance for credit losses	(0.1)	(0.1)
Estimated fair value	1,800.4	1,747.3
Agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	810.6	838.3
Gross unrealized gains	9.5	11.4
Gross unrealized losses	(0.9)	(0.2)
Allowance for credit losses	0.0	0.0
Estimated fair value	819.2	849.5
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,556.2	1,639.1
Gross unrealized gains	32.7	37.5
Gross unrealized losses	(85.5)	(90.9)
Allowance for credit losses	0.0	0.0
Estimated fair value	1,503.4	1,585.7
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,466.5	1,142.4
Gross unrealized gains	1.3	2.8
Gross unrealized losses	(4.2)	(2.7)
Allowance for credit losses	0.0	0.0
Estimated fair value	1,463.6	1,142.5
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,250.9	2,157.5
Gross unrealized gains	4.1	6.4
Gross unrealized losses	(116.5)	(114.7)
Allowance for credit losses	(2.2)	(2.2)
Estimated fair value	2,136.3	2,047.0
Total fixed maturities, available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized cost	26,081.4	25,776.4
Gross unrealized gains	116.8	235.3
Gross unrealized losses	(2,273.2)	(2,088.9)
Allowance for credit losses	(43.9)	(36.0)
Estimated fair value	$ 23,881.1	$ 23,886.8

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