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INVESTMENTS - Marketable Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 49.4 $ 51.4
Total Net Gains 0.4 0.0
Total Net Losses 0.0 (0.3)
Fair Value 49.8 51.1
Fair Value of Securities with Contractual Maturities    
Within 1 Year 8.0 9.1
After 1 Year through 5 Years 32.4 34.5
After 5 Years 9.4 7.5
U.S. Treasury    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 18.5 20.4
Total Net Gains 0.1 0.0
Total Net Losses 0.0 (0.2)
Fair Value 18.6 20.2
Fair Value of Securities with Contractual Maturities    
Within 1 Year 3.6 3.4
After 1 Year through 5 Years 11.6 13.8
After 5 Years 3.4 3.1
Municipal securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 8.6 10.0
Total Net Gains 0.1 0.0
Total Net Losses 0.0 0.0
Fair Value 8.7 10.0
Fair Value of Securities with Contractual Maturities    
Within 1 Year 0.0 1.5
After 1 Year through 5 Years 7.4 7.0
After 5 Years 1.3 1.5
Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 22.3 21.0
Total Net Gains 0.2 0.0
Total Net Losses 0.0 (0.1)
Fair Value 22.5 20.9
Fair Value of Securities with Contractual Maturities    
Within 1 Year 4.4 4.2
After 1 Year through 5 Years 13.4 13.7
After 5 Years $ 4.7 $ 2.9