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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, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 25,106.1
Allowance for credit losses	(39.8)	$ (39.0)	$ (42.9)	$ (66.1)	$ (59.1)	$ (56.0)
Estimated fair value	22,617.9		21,506.2
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	13,450.7		13,186.9
Gross unrealized gains	43.4		74.7
Gross unrealized losses	(1,667.4)		(1,382.4)
Allowance for credit losses	(38.6)	(37.7)	(41.7)	(64.4)	(57.2)	(54.4)
Estimated fair value	11,788.1		11,837.5
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost	470.2
Gross unrealized gains	3.5
Gross unrealized losses	0.0
Allowance for credit losses	0.0
Estimated fair value	473.7
United States Treasury securities and obligations of United States government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	278.6		207.6
Gross unrealized gains	0.0		0.1
Gross unrealized losses	(22.1)		(13.3)
Allowance for credit losses	0.0		0.0
Estimated fair value	256.5		194.4
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,192.5		2,896.8
Gross unrealized gains	18.6		31.3
Gross unrealized losses	(399.7)		(360.7)
Allowance for credit losses	(0.6)	(0.6)	(0.7)	(1.0)	(0.8)	(0.9)
Estimated fair value	2,810.8		2,566.7
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	101.1		92.7
Gross unrealized gains	0.4		1.2
Gross unrealized losses	(13.3)		(10.4)
Allowance for credit losses	(0.5)	(0.6)	(0.4)	(0.5)	(0.5)	(0.4)
Estimated fair value	87.7		83.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,552.2		1,476.2
Gross unrealized gains	4.5		4.1
Gross unrealized losses	(87.9)		(107.8)
Allowance for credit losses	(0.1)	$ (0.1)	(0.1)	$ (0.2)	$ (0.6)	$ (0.3)
Estimated fair value	1,468.7		1,372.4
Agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	787.3		639.0
Gross unrealized gains	6.1		9.5
Gross unrealized losses	(4.0)		(0.5)
Allowance for credit losses	0.0		0.0
Estimated fair value	789.4		648.0
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,667.2		1,670.1
Gross unrealized gains	30.4		35.8
Gross unrealized losses	(144.8)		(152.7)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,552.8		1,553.2
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,227.6		1,042.5
Gross unrealized gains	5.1		3.3
Gross unrealized losses	(7.8)		(13.0)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,224.9		1,032.8
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,378.7		2,487.4
Gross unrealized gains	1.2		0.7
Gross unrealized losses	(214.6)		(270.0)
Allowance for credit losses	0.0		0.0
Estimated fair value	2,165.3		2,218.1
Total fixed maturities, available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized cost	25,106.1		23,699.2
Gross unrealized gains	113.2		160.7
Gross unrealized losses	(2,561.6)		(2,310.8)
Allowance for credit losses	(39.8)		(42.9)
Estimated fair value	$ 22,617.9		$ 21,506.2

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