XML 71 R52.htm IDEA: XBRL DOCUMENT v3.25.3
INVESTMENTS - Marketable Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 51.9 $ 51.4
Total Net Gains 0.7 0.0
Total Net Losses 0.0 (0.3)
Fair Value 52.6 51.1
Fair Value of Securities with Contractual Maturities    
Within 1 Year 8.7 9.1
After 1 Year through 5 Years 34.1 34.5
After 5 Years 9.8 7.5
U.S. Treasury    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 21.3 20.4
Total Net Gains 0.2 0.0
Total Net Losses 0.0 (0.2)
Fair Value 21.5 20.2
Fair Value of Securities with Contractual Maturities    
Within 1 Year 3.7 3.4
After 1 Year through 5 Years 14.3 13.8
After 5 Years 3.5 3.1
Municipal securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 8.9 10.0
Total Net Gains 0.2 0.0
Total Net Losses 0.0 0.0
Fair Value 9.1 10.0
Fair Value of Securities with Contractual Maturities    
Within 1 Year 0.0 1.5
After 1 Year through 5 Years 7.5 7.0
After 5 Years 1.6 1.5
Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 21.7 21.0
Total Net Gains 0.3 0.0
Total Net Losses 0.0 (0.1)
Fair Value 22.0 20.9
Fair Value of Securities with Contractual Maturities    
Within 1 Year 5.0 4.2
After 1 Year through 5 Years 12.3 13.7
After 5 Years $ 4.7 $ 2.9