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INVESTMENTS - Schedule of Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 841.7 | $ 81.8
Gross unrealized losses, less than 12 months | (0.7) | (0.2)
Fair value, 12 months or greater | 44.1 | 69.8
Gross unrealized losses, 12 months or greater | (0.8) | (1.2)
Fair value, total | 885.8 | 151.6
Gross unrealized losses, total | (1.5) | (1.4)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 241.9 | 0.0
Gross unrealized losses, less than 12 months | (0.1) | 0.0
Fair value, 12 months or greater | 8.0 | 11.2
Gross unrealized losses, 12 months or greater | (0.3) | (0.4)
Fair value, total | 249.9 | 11.2
Gross unrealized losses, total | (0.4) | (0.4)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 13.2 | 5.1
Gross unrealized losses, less than 12 months | (0.1) | (0.1)
Fair value, 12 months or greater | 20.8 | 24.3
Gross unrealized losses, 12 months or greater | (0.4) | (0.5)
Fair value, total | 34.0 | 29.4
Gross unrealized losses, total | (0.5) | (0.6)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 586.6 | 76.7
Gross unrealized losses, less than 12 months | (0.5) | (0.1)
Fair value, 12 months or greater | 15.3 | 34.3
Gross unrealized losses, 12 months or greater | (0.1) | (0.3)
Fair value, total | 601.9 | 111.0
Gross unrealized losses, total | $ (0.6) | $ (0.4)

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