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INVESTMENTS - Carrying Amounts of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 349.8 $ 331.6
Gross Unrealized Gains 1.6 3.5
Gross Unrealized Losses (2.7) (2.2)
Fair Value 348.6 332.9
Interest receivable 2.8 2.5
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)
Fair Value 207.3 153.6
Unrealized Losses (2.7) (2.2)
Short-term investments    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 14.4 6.3
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 (0.1)
Fair Value 14.4 6.2
Less than 12 months, fair value 0.3  
Less than 12 months, gross unrealized losses 0.0  
12 months or longer, fair value 3.9  
12 months or longer, gross unrealized losses 0.0  
Fair Value 4.1  
Unrealized Losses 0.0  
U.S Treasury    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2.6 13.6
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses 0.0 (0.1)
Fair Value 2.6 13.5
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)
Fair Value 2.5 8.5
Unrealized Losses 0.0 (0.1)
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 10.6 30.1
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses (0.1) (0.2)
Fair Value 10.6 30.1
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)
Fair Value 4.9 16.8
Unrealized Losses (0.1) (0.2)
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 152.0 131.5
Gross Unrealized Gains 0.8 1.6
Gross Unrealized Losses (0.9) (0.9)
Fair Value 151.9 132.2
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)
Fair Value 90.9 59.4
Unrealized Losses (0.9) (0.9)
Mortgage and other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 170.1 150.1
Gross Unrealized Gains 0.6 1.6
Gross Unrealized Losses (1.7) (0.9)
Fair Value 169.1 150.9
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)
Fair Value 104.9 62.9
Unrealized Losses $ (1.7) $ (0.9)