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INVESTMENTS - SCHEDULE OF FIXED MATURITIES AVAILABLE FOR SALE (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 25,264.3
Allowance for credit losses	(37.1)	$ (42.9)	$ (56.0)	$ (7.6)
Estimated fair value	22,840.5	21,506.2
Below-investment Grade
Debt Securities, Available-for-sale [Line Items]
Estimated fair value	1,225.5
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Allowance for credit losses	(31.1)	(41.7)	(54.4)	(7.4)
Corporate securities | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	13,107.1	12,590.8
Gross unrealized gains	55.5	73.0
Gross unrealized losses	(1,632.9)	(1,347.8)
Allowance for credit losses	(22.5)	(26.6)
Estimated fair value	11,507.2	11,289.4
Corporate securities | Below-investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	678.2	596.1
Gross unrealized gains	4.9	1.7
Gross unrealized losses	(30.4)	(34.6)
Allowance for credit losses	(8.6)	(15.1)
Estimated fair value	644.1	548.1
Certificates of deposit | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	470.0
Gross unrealized gains	18.3
Gross unrealized losses	0.0
Allowance for credit losses	0.0
Estimated fair value	488.3
United States Treasury securities and obligations of United States government corporations and agencies | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	214.8	207.6
Gross unrealized gains	0.0	0.1
Gross unrealized losses	(28.6)	(13.3)
Allowance for credit losses	0.0	0.0
Estimated fair value	186.2	194.4
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Allowance for credit losses	(3.3)	(0.7)	(0.9)	0.0
States and political subdivisions | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,238.3	2,887.2
Gross unrealized gains	12.1	31.3
Gross unrealized losses	(434.6)	(360.2)
Allowance for credit losses	(0.5)	(0.6)
Estimated fair value	2,815.3	2,557.7
States and political subdivisions | Below-investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	23.6	9.6
Gross unrealized gains	0.1	0.0
Gross unrealized losses	(1.8)	(0.5)
Allowance for credit losses	(2.9)	(0.1)
Estimated fair value	19.0	9.0
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Allowance for credit losses	(1.0)	(0.4)	(0.4)	(0.2)
Foreign governments | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	107.3	92.7
Gross unrealized gains	0.1	1.2
Gross unrealized losses	(15.3)	(10.4)
Allowance for credit losses	(0.9)	(0.4)
Estimated fair value	91.2	83.1
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Allowance for credit losses	(0.1)	(0.1)	(0.3)	0.0
Asset-backed securities | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,475.1	1,364.5
Gross unrealized gains	7.5	3.9
Gross unrealized losses	(56.6)	(92.4)
Allowance for credit losses	(0.1)	(0.1)
Estimated fair value	1,425.9	1,275.9
Asset-backed securities | Below-investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	99.5	111.7
Gross unrealized gains	0.8	0.2
Gross unrealized losses	(9.9)	(15.4)
Allowance for credit losses	0.0	0.0
Estimated fair value	90.4	96.5
Agency residential mortgage-backed securities | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	819.8	639.0
Gross unrealized gains	5.3	9.5
Gross unrealized losses	(5.5)	(0.5)
Allowance for credit losses	0.0	0.0
Estimated fair value	819.6	648.0
Non-agency residential mortgage-backed securities | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,253.4	1,170.8
Gross unrealized gains	11.5	7.0
Gross unrealized losses	(121.6)	(136.3)
Allowance for credit losses	0.0	0.0
Estimated fair value	1,143.3	1,041.5
Non-agency residential mortgage-backed securities | Below-investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	382.9	499.3
Gross unrealized gains	22.0	28.8
Gross unrealized losses	(9.2)	(16.4)
Allowance for credit losses	0.0	0.0
Estimated fair value	395.7	511.7
Collateralized loan obligations | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,015.2	1,042.5
Gross unrealized gains	5.6	3.3
Gross unrealized losses	(4.0)	(13.0)
Allowance for credit losses	0.0	0.0
Estimated fair value	1,016.8	1,032.8
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Allowance for credit losses	(1.6)	0.0	$ 0.0	$ 0.0
Commercial mortgage-backed securities | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,275.3	2,386.9
Gross unrealized gains	3.7	0.7
Gross unrealized losses	(157.8)	(240.9)
Allowance for credit losses	0.0	0.0
Estimated fair value	2,121.2	2,146.7
Commercial mortgage-backed securities | Below-investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	103.8	100.5
Gross unrealized gains	0.0	0.0
Gross unrealized losses	(25.9)	(29.1)
Allowance for credit losses	(1.6)	0.0
Estimated fair value	76.3	71.4
Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	25,264.3	23,699.2
Gross unrealized gains	147.4	160.7
Gross unrealized losses	(2,534.1)	(2,310.8)
Allowance for credit losses	(37.1)	(42.9)
Estimated fair value	22,840.5	21,506.2
Fixed Maturities | Investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	23,976.3	22,382.0
Gross unrealized gains	119.6	130.0
Gross unrealized losses	(2,456.9)	(2,214.8)
Allowance for credit losses	(24.0)	(27.7)
Estimated fair value	21,615.0	20,269.5
Fixed Maturities | Below-investment Grade
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,288.0	1,317.2
Gross unrealized gains	27.8	30.7
Gross unrealized losses	(77.2)	(96.0)
Allowance for credit losses	(13.1)	(15.2)
Estimated fair value	$ 1,225.5	$ 1,236.7

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