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INVESTMENTS - SCHEDULE OF STRUCTURED SECURITIES (Details) $ in Millions	Dec. 31, 2024 USD ($)
Structured Securities [Line Items]
Amortized cost	$ 7,425.0
Estimated fair value, Amount	$ 7,089.3
Estimated fair value, Percent of fixed maturities	31.00%
Asset-backed securities
Structured Securities [Line Items]
Amortized cost	$ 1,574.6
Estimated fair value, Amount	$ 1,516.4
Estimated fair value, Percent of fixed maturities	6.60%
Agency residential mortgage-backed securities
Structured Securities [Line Items]
Amortized cost	$ 819.8
Estimated fair value, Amount	$ 819.6
Estimated fair value, Percent of fixed maturities	3.60%
Non-agency residential mortgage-backed securities
Structured Securities [Line Items]
Amortized cost	$ 1,636.3
Estimated fair value, Amount	$ 1,539.1
Estimated fair value, Percent of fixed maturities	6.70%
Collateralized loan obligations
Structured Securities [Line Items]
Amortized cost	$ 1,015.2
Estimated fair value, Amount	$ 1,016.8
Estimated fair value, Percent of fixed maturities	4.50%
Commercial mortgage-backed securities
Structured Securities [Line Items]
Amortized cost	$ 2,379.1
Estimated fair value, Amount	$ 2,197.4
Estimated fair value, Percent of fixed maturities	9.60%