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INVESTMENTS - Schedule of Unrealized Losses on Debt Securities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 8.4 | $ 35.2
Gross unrealized losses, less than 12 months | (0.1) | (1.9)
Fair value, 12 months or greater | 214.2 | 843.7
Gross unrealized losses, 12 months or greater | (5.2) | (25.6)
Total fair value | 222.6 | 878.9
Total gross unrealized losses | (5.3) | (27.5)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 0.0 | 0.0
Gross unrealized losses, less than 12 months | 0.0 | 0.0
Fair value, 12 months or greater | 19.9 | 67.1
Gross unrealized losses, 12 months or greater | (1.1) | (2.8)
Total fair value | 19.9 | 67.1
Total gross unrealized losses | (1.1) | (2.8)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 8.4 | 10.2
Gross unrealized losses, less than 12 months | (0.1) | (1.8)
Fair value, 12 months or greater | 53.3 | 172.7
Gross unrealized losses, 12 months or greater | (1.3) | (6.0)
Total fair value | 61.7 | 182.9
Total gross unrealized losses | (1.4) | (7.8)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 0.0 | 25.0
Gross unrealized losses, less than 12 months | 0.0 | (0.1)
Fair value, 12 months or greater | 141.0 | 601.3
Gross unrealized losses, 12 months or greater | (2.8) | (16.6)
Total fair value | 141.0 | 626.3
Total gross unrealized losses | $ (2.8) | (16.7)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months |  | 0.0
Gross unrealized losses, less than 12 months |  | 0.0
Fair value, 12 months or greater |  | 2.6
Gross unrealized losses, 12 months or greater |  | (0.2)
Total fair value |  | 2.6
Total gross unrealized losses |  | $ (0.2)

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