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INVESTMENTS - Schedule of Gross Realized Gains and Losses (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value $ 147.5 $ 51.1
Less than 12 months, gross unrealized losses (1.6) (0.7)
12 months or longer, fair value 59.8 102.5
12 months or longer, gross unrealized losses (1.2) (1.6)
Total Fair Value 207.3 153.6
Total Gross Unrealized Losses (2.7) (2.2)
Short-term investments    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 0.0  
Less than 12 months, gross unrealized losses 0.0  
12 months or longer, fair value 6.0  
12 months or longer, gross unrealized losses (0.1)  
Total Fair Value 6.0  
Total Gross Unrealized Losses (0.1)  
U.S Treasury    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 1.1 3.4
Less than 12 months, gross unrealized losses 0.0 (0.1)
12 months or longer, fair value 1.4 5.0
12 months or longer, gross unrealized losses 0.0 (0.1)
Total Fair Value 2.5 8.5
Total Gross Unrealized Losses 0.0 (0.1)
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 3.4 6.4
Less than 12 months, gross unrealized losses (0.1) (0.1)
12 months or longer, fair value 1.6 10.4
12 months or longer, gross unrealized losses 0.0 (0.1)
Total Fair Value 4.9 16.8
Total Gross Unrealized Losses (0.1) (0.2)
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 64.3 11.4
Less than 12 months, gross unrealized losses (0.5) (0.1)
12 months or longer, fair value 26.6 48.0
12 months or longer, gross unrealized losses (0.4) (0.8)
Total Fair Value 90.9 59.4
Total Gross Unrealized Losses (0.9) (0.9)
Mortgage and other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 78.5 29.8
Less than 12 months, gross unrealized losses (1.0) (0.4)
12 months or longer, fair value 26.4 33.1
12 months or longer, gross unrealized losses (0.7) (0.5)
Total Fair Value 104.9 62.9
Total Gross Unrealized Losses $ (1.7) $ (0.9)