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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	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 25,246.4
Allowance for credit losses	(25.9)	$ (39.8)	$ (42.9)	$ (69.4)	$ (66.1)	$ (56.0)
Estimated fair value	23,724.7		21,506.2
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	13,725.2		13,186.9
Gross unrealized gains	159.0		74.7
Gross unrealized losses	(1,131.0)		(1,382.4)
Allowance for credit losses	(24.5)	(38.6)	(41.7)	(66.8)	(64.4)	(54.4)
Estimated fair value	12,728.7		11,837.5
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost	470.0
Gross unrealized gains	13.1
Gross unrealized losses	0.0
Allowance for credit losses	0.0
Estimated fair value	483.1
United States Treasury securities and obligations of United States government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	210.8		207.6
Gross unrealized gains	0.1		0.1
Gross unrealized losses	(11.6)		(13.3)
Allowance for credit losses	0.0		0.0
Estimated fair value	199.3		194.4
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,223.2		2,896.8
Gross unrealized gains	46.3		31.3
Gross unrealized losses	(301.0)		(360.7)
Allowance for credit losses	(0.8)	(0.6)	(0.7)	(1.7)	(1.0)	(0.9)
Estimated fair value	2,967.7		2,566.7
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	103.2		92.7
Gross unrealized gains	1.6		1.2
Gross unrealized losses	(9.6)		(10.4)
Allowance for credit losses	(0.5)	(0.5)	(0.4)	(0.7)	(0.5)	(0.4)
Estimated fair value	94.7		83.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,578.5		1,476.2
Gross unrealized gains	13.7		4.1
Gross unrealized losses	(57.1)		(107.8)
Allowance for credit losses	(0.1)	$ (0.1)	(0.1)	$ (0.2)	$ (0.2)	$ (0.3)
Estimated fair value	1,535.0		1,372.4
Agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	812.5		639.0
Gross unrealized gains	14.5		9.5
Gross unrealized losses	(0.1)		(0.5)
Allowance for credit losses	0.0		0.0
Estimated fair value	826.9		648.0
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,670.0		1,670.1
Gross unrealized gains	42.8		35.8
Gross unrealized losses	(104.1)		(152.7)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,608.7		1,553.2
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,083.2		1,042.5
Gross unrealized gains	4.5		3.3
Gross unrealized losses	(5.5)		(13.0)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,082.2		1,032.8
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,369.8		2,487.4
Gross unrealized gains	4.7		0.7
Gross unrealized losses	(176.1)		(270.0)
Allowance for credit losses	0.0		0.0
Estimated fair value	2,198.4		2,218.1
Total fixed maturities, available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized cost	25,246.4		23,699.2
Gross unrealized gains	300.3		160.7
Gross unrealized losses	(1,796.1)		(2,310.8)
Allowance for credit losses	(25.9)		(42.9)
Estimated fair value	$ 23,724.7		$ 21,506.2

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