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INVESTMENTS - Marketable Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 51.2 $ 51.4
Total Net Gains 0.3 0.0
Total Net Losses 0.0 (0.3)
Fair Value 51.5 51.1
Fair Value of Securities with Contractual Maturities    
Within 1 Year 9.3 9.1
After 1 Year through 5 Years 34.5 34.5
After 5 Years 7.7 7.5
U.S. Treasury    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 19.9 20.4
Total Net Gains 0.1 0.0
Total Net Losses 0.0 (0.2)
Fair Value 20.0 20.2
Fair Value of Securities with Contractual Maturities    
Within 1 Year 3.5 3.4
After 1 Year through 5 Years 13.3 13.8
After 5 Years 3.2 3.1
Municipal securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 10.0 10.0
Total Net Gains 0.1 0.0
Total Net Losses 0.0 0.0
Fair Value 10.1 10.0
Fair Value of Securities with Contractual Maturities    
Within 1 Year 1.5 1.5
After 1 Year through 5 Years 7.1 7.0
After 5 Years 1.5 1.5
Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 21.3 21.0
Total Net Gains 0.1 0.0
Total Net Losses 0.0 (0.1)
Fair Value 21.4 20.9
Fair Value of Securities with Contractual Maturities    
Within 1 Year 4.3 4.2
After 1 Year through 5 Years 14.1 13.7
After 5 Years $ 3.0 $ 2.9