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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, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 23,899.5		$ 23,384.2
Allowance for credit losses	(69.4)	$ (66.1)	(56.0)	$ (52.0)	$ (54.2)	$ (7.6)
Estimated fair value	20,305.2		20,353.4
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	13,312.1		13,649.1
Gross unrealized gains	10.7		29.9
Gross unrealized losses	(2,297.1)		(1,911.9)
Allowance for credit losses	(66.8)	(64.4)	(54.4)	(49.2)	(52.2)	(7.4)
Estimated fair value	10,958.9		11,712.7
United States Treasury securities and obligations of United States government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized cost	194.2		171.7
Gross unrealized gains	0.0		0.0
Gross unrealized losses	(28.8)		(13.0)
Allowance for credit losses	0.0		0.0
Estimated fair value	165.4		158.7
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,848.5		2,846.9
Gross unrealized gains	7.0		19.3
Gross unrealized losses	(547.8)		(476.8)
Allowance for credit losses	(1.7)	(1.0)	(0.9)	(1.7)	(1.1)	0.0
Estimated fair value	2,306.0		2,388.5
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	93.3		86.3
Gross unrealized gains	0.0		0.1
Gross unrealized losses	(16.6)		(11.3)
Allowance for credit losses	(0.7)	(0.5)	(0.4)	(0.8)	(0.7)	(0.2)
Estimated fair value	76.0		74.7
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,500.2		1,435.7
Gross unrealized gains	0.2		1.0
Gross unrealized losses	(141.0)		(149.4)
Allowance for credit losses	(0.2)	$ (0.2)	(0.3)	$ (0.3)	$ (0.2)	$ 0.0
Estimated fair value	1,359.2		1,287.0
Agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	627.9		174.3
Gross unrealized gains	0.6		1.4
Gross unrealized losses	(12.6)		(0.7)
Allowance for credit losses	0.0		0.0
Estimated fair value	615.9		175.0
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,695.8		1,700.4
Gross unrealized gains	33.7		40.0
Gross unrealized losses	(204.3)		(191.9)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,525.2		1,548.5
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,077.7		825.2
Gross unrealized gains	1.9		0.3
Gross unrealized losses	(20.1)		(39.6)
Allowance for credit losses	0.0		0.0
Estimated fair value	1,059.5		785.9
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,549.8		2,494.6
Gross unrealized gains	0.6		0.1
Gross unrealized losses	(311.3)		(272.3)
Allowance for credit losses	0.0		0.0
Estimated fair value	2,239.1		2,222.4
Total fixed maturities, available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized cost	23,899.5		23,384.2
Gross unrealized gains	54.7		92.1
Gross unrealized losses	(3,579.6)		(3,066.9)
Allowance for credit losses	(69.4)		(56.0)
Estimated fair value	$ 20,305.2		$ 20,353.4

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