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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	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 25,228.8
Allowance for credit losses	(39.1)	$ (38.9)	$ (37.1)	$ (39.8)	$ (39.0)	$ (42.9)
Estimated fair value	23,047.0		22,730.1
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	14,058.9		13,672.1
Gross unrealized gains	112.6		60.2
Gross unrealized losses	(1,561.0)		(1,660.4)
Allowance for credit losses	(33.1)	$ (33.1)	(31.1)	$ (38.6)	$ (37.7)	$ (41.7)
Estimated fair value	12,577.4		12,040.8
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost	0.0		470.0
Gross unrealized gains	0.0		18.3
Gross unrealized losses	0.0		0.0
Allowance for credit losses	0.0		0.0
Estimated fair value	0.0		488.3
United States Treasury securities and obligations of United States government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	217.9		214.8
Gross unrealized gains	0.0		0.0
Gross unrealized losses	(29.7)		(28.6)
Allowance for credit losses	0.0		0.0
Estimated fair value	188.2		186.2
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,342.3		3,261.9
Gross unrealized gains	18.2		12.2
Gross unrealized losses	(423.6)		(436.4)
Allowance for credit losses	(2.9)		(3.4)
Estimated fair value	2,934.0		2,834.3
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	113.6		107.2
Gross unrealized gains	0.5		0.1
Gross unrealized losses	(13.8)		(15.3)
Allowance for credit losses	(0.8)		(0.9)
Estimated fair value	99.5		91.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,593.0		1,574.6
Gross unrealized gains	10.3		8.3
Gross unrealized losses	(51.9)		(66.4)
Allowance for credit losses	(0.1)		(0.1)
Estimated fair value	1,551.3		1,516.4
Agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	910.7		819.8
Gross unrealized gains	9.7		5.3
Gross unrealized losses	(1.3)		(5.5)
Allowance for credit losses	0.0		0.0
Estimated fair value	919.1		819.6
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,608.0		1,636.3
Gross unrealized gains	36.8		33.6
Gross unrealized losses	(108.6)		(130.8)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,536.2		1,539.1
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,091.7		1,015.2
Gross unrealized gains	3.8		5.6
Gross unrealized losses	(5.0)		(4.0)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,090.5		1,016.8
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,292.7		2,379.1
Gross unrealized gains	5.2		3.7
Gross unrealized losses	(144.9)		(183.7)
Allowance for credit losses	(2.2)		(1.6)
Estimated fair value	2,150.8		2,197.5
Total fixed maturities, available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized cost	25,228.8		25,151.0
Gross unrealized gains	197.1		147.3
Gross unrealized losses	(2,339.8)		(2,531.1)
Allowance for credit losses	(39.1)		(37.1)
Estimated fair value	$ 23,047.0		$ 22,730.1

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