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INVESTMENTS - Schedule of Unrealized Losses on Debt Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 35.2 | $ 353.9
Gross unrealized losses, less than 12 months | (1.9) | (8.1)
Fair value, 12 months or greater | 843.7 | 1,111.4
Gross unrealized losses, 12 months or greater | (25.6) | (60.0)
Total fair value | 878.9 | 1,465.3
Total gross unrealized losses | (27.5) | (68.1)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 0.0 | 61.6
Gross unrealized losses, less than 12 months | 0.0 | (1.5)
Fair value, 12 months or greater | 67.1 | 69.5
Gross unrealized losses, 12 months or greater | (2.8) | (4.6)
Total fair value | 67.1 | 131.1
Total gross unrealized losses | (2.8) | (6.1)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 10.2 | 103.3
Gross unrealized losses, less than 12 months | (1.8) | (1.3)
Fair value, 12 months or greater | 172.7 | 254.6
Gross unrealized losses, 12 months or greater | (6.0) | (12.7)
Total fair value | 182.9 | 357.9
Total gross unrealized losses | (7.8) | (14.0)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 25.0 | 189.0
Gross unrealized losses, less than 12 months | (0.1) | (5.3)
Fair value, 12 months or greater | 601.3 | 784.8
Gross unrealized losses, 12 months or greater | (16.6) | (42.5)
Total fair value | 626.3 | 973.8
Total gross unrealized losses | (16.7) | (47.8)
Municipal 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 | 2.6 | 2.5
Gross unrealized losses, 12 months or greater | (0.2) | (0.2)
Total fair value | 2.6 | 2.5
Total gross unrealized losses | $ (0.2) | $ (0.2)

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