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INVESTMENTS - SCHEDULE OF INVESTMENTS IN OUR PORTFOLIO RATED BELOW-INVESTMENT GRADE WHICH HAVE BEEN CONTINUOUSLY IN AN UNREALIZED LOSS POSITION EXCEEDING 20% OF THE COST BASIS (Details)
$ in Millions
Dec. 31, 2024
USD ($)
issuer
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Total, unrealized loss $ (70.7) $ (24.5)
Below-investment Grade    
Debt Securities, Available-for-sale [Line Items]    
Less than 6 months, Number of issuers | issuer 2  
Less than 6 months, Cost basis $ 25.2  
Less than 6 months, Unrealized loss (6.4)  
Less than 6 months, Estimated fair value $ 18.8  
Greater than 12 months, Number of issuers | issuer 4  
Greater than 12 months, Cost basis $ 49.8  
Greater than 12 months, Unrealized loss (19.0)  
Greater than 12 months, Estimated fair value 30.8  
Total, cost basis 75.0  
Total, unrealized loss (25.4)  
Total, estimated fair value $ 49.6