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INVESTMENTS - Schedule of Gross Realized Gains and Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value $ 49.5 $ 147.5
Less than 12 months, unrealized losses (0.3) (1.6)
12 months or longer, fair value 32.9 59.8
12 months or longer, unrealized losses (0.6) (1.2)
Total fair value 82.4 207.3
Total unrealized losses (0.8) (2.7)
Short-term investments    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 0.0 0.3
Less than 12 months, unrealized losses 0.0 0.0
12 months or longer, fair value 2.1 3.9
12 months or longer, unrealized losses 0.0 0.0
Total fair value 2.1 4.1
Total unrealized losses 0.0 0.0
U.S. Treasury    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 0.0 1.1
Less than 12 months, unrealized losses 0.0 0.0
12 months or longer, fair value 0.8 1.4
12 months or longer, unrealized losses 0.0 0.0
Total fair value 0.8 2.5
Total unrealized losses 0.0 0.0
Municipal    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 0.0 3.4
Less than 12 months, unrealized losses 0.0 (0.1)
12 months or longer, fair value 1.4 1.6
12 months or longer, unrealized losses 0.0 0.0
Total fair value 1.4 4.9
Total unrealized losses 0.0 (0.1)
Corporate    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 11.3 64.3
Less than 12 months, unrealized losses (0.1) (0.5)
12 months or longer, fair value 6.0 26.6
12 months or longer, unrealized losses (0.1) (0.4)
Total fair value 17.4 90.9
Total unrealized losses (0.1) (0.9)
Mortgage and other asset-backed securities    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 38.2 78.5
Less than 12 months, unrealized losses (0.2) (1.0)
12 months or longer, fair value 22.5 26.4
12 months or longer, unrealized losses (0.4) (0.7)
Total fair value 60.6 104.9
Total unrealized losses $ (0.7) $ (1.7)