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INVESTMENTS - Contractual Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 39.0  
Due after one year through five years 151.4  
Due five years through 10 years 24.7  
Due after 10 years 23.8  
Amortized Cost 238.9 $ 169.3
Fair Value    
Due in one year or less 38.6  
Due after one year through five years 149.1  
Due five years through 10 years 24.5  
Due after 10 years 23.3  
Total $ 235.5 $ 166.8