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INVESTMENTS - Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | $ 58.2 | $ 53.3
Total Net Gains | 0.2 | 0.7
Total Net Losses | (0.3) | 0.0
Fair Value | 58.1 | 54.0
Fair Value of Securities with Contractual Maturities |  |
Within 1 Year | 8.6 | 7.8
After 1 Year through 5 Years | 36.1 | 37.8
After 5 Years | 13.4 | 8.4
U.S. Treasury |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 20.1 | 21.4
Total Net Gains | 0.0 | 0.2
Total Net Losses | (0.1) | 0.0
Fair Value | 20.0 | 21.6
Fair Value of Securities with Contractual Maturities |  |
Within 1 Year | 3.6 | 3.7
After 1 Year through 5 Years | 12.1 | 14.5
After 5 Years | 4.3 | 3.4
Municipal securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 10.5 | 10.4
Total Net Gains | 0.1 | 0.2
Total Net Losses | (0.1) | 0.0
Fair Value | 10.5 | 10.6
Fair Value of Securities with Contractual Maturities |  |
Within 1 Year | 1.6 | 0.1
After 1 Year through 5 Years | 7.5 | 9.0
After 5 Years | 1.4 | 1.5
Corporate debt |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 27.6 | 21.5
Total Net Gains | 0.1 | 0.3
Total Net Losses | (0.1) | 0.0
Fair Value | 27.6 | 21.8
Fair Value of Securities with Contractual Maturities |  |
Within 1 Year | 3.4 | 4.0
After 1 Year through 5 Years | 16.5 | 14.3
After 5 Years | $ 7.7 | $ 3.5

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