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INVESTMENTS - Schedule of Gross Realized Gains and Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value $ 51.0 $ 51.1
Less than 12 months, unrealized losses (0.5) (0.7)
12 months or longer, fair value 180.3 102.5
12 months or longer, unrealized losses (3.8) (1.6)
Total fair value 231.3 153.6
Total unrealized losses (4.3) (2.2)
Short-term investments    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 0.0 0.0
Less than 12 months, unrealized losses 0.0 0.0
12 months or longer, fair value 8.1 6.0
12 months or longer, unrealized losses (0.1) (0.1)
Total fair value 8.1 6.0
Total unrealized losses (0.1) (0.1)
U.S. Treasury    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 4.0 3.4
Less than 12 months, unrealized losses 0.0 (0.1)
12 months or longer, fair value 8.2 5.0
12 months or longer, unrealized losses (0.2) (0.1)
Total fair value 12.2 8.5
Total unrealized losses (0.3) (0.1)
Municipal    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 2.3 6.4
Less than 12 months, unrealized losses 0.0 (0.1)
12 months or longer, fair value 22.5 10.4
12 months or longer, unrealized losses (0.5) (0.1)
Total fair value 24.8 16.8
Total unrealized losses (0.5) (0.2)
Corporate    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 22.7 11.4
Less than 12 months, unrealized losses (0.2) (0.1)
12 months or longer, fair value 81.9 48.0
12 months or longer, unrealized losses (1.6) (0.8)
Total fair value 104.6 59.4
Total unrealized losses (1.8) (0.9)
Mortgage and other asset-backed securities    
Gain (Loss) on Securities [Line Items]    
Less than 12 months, fair value 22.0 29.8
Less than 12 months, unrealized losses (0.3) (0.4)
12 months or longer, fair value 59.5 33.1
12 months or longer, unrealized losses (1.3) (0.5)
Total fair value 81.6 62.9
Total unrealized losses $ (1.6) $ (0.9)