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INVESTMENTS - SUMMARY OF FIXED MATURITY SECURITIES AVAILABLE FOR SALE (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 25,264.3
Estimated fair value	$ 22,840.5	$ 21,506.2
Percentage of total estimated fair value	100.00%
NAIC designation 1
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 16,091.7
Estimated fair value	$ 14,522.4
Percentage of total estimated fair value	63.60%
NAIC designation 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 8,261.4
Estimated fair value	$ 7,480.6
Percentage of total estimated fair value	32.80%
Total NAIC 1 and 2 (investment grade)
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 24,353.1
Estimated fair value	$ 22,003.0
Percentage of total estimated fair value	96.40%
NAIC designation 3
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 635.2
Estimated fair value	$ 598.6
Percentage of total estimated fair value	2.60%
NAIC designation 4
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 236.2
Estimated fair value	$ 211.2
Percentage of total estimated fair value	0.90%
NAIC designation 5
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 18.6
Estimated fair value	$ 13.9
Percentage of total estimated fair value	0.10%
NAIC designation 6
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 21.2
Estimated fair value	$ 13.8
Percentage of total estimated fair value	0.00%
Total NAIC 3,4,5 and 6 (below-investment grade)
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 911.2
Estimated fair value	$ 837.5
Percentage of total estimated fair value	3.60%

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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