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INVESTMENTS - Investments in Continuous Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | $ 100.5 | $ 353.9
Gross unrealized losses, less than twelve months | (1.0) | (8.1)
Fair value, twelve months or greater | 1,191.2 | 1,111.4
Gross unrealized losses, twelve months or greater | (54.1) | (60.0)
Fair value, total | 1,291.7 | 1,465.3
Gross unrealized losses, total | (55.1) | (68.1)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 10.6 | 61.6
Gross unrealized losses, less than twelve months | (0.1) | (1.5)
Fair value, twelve months or greater | 92.2 | 69.5
Gross unrealized losses, twelve months or greater | (4.8) | (4.6)
Fair value, total | 102.8 | 131.1
Gross unrealized losses, total | (4.9) | (6.1)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 59.1 | 103.3
Gross unrealized losses, less than twelve months | (0.8) | (1.3)
Fair value, twelve months or greater | 224.7 | 254.6
Gross unrealized losses, twelve months or greater | (10.4) | (12.7)
Fair value, total | 283.8 | 357.9
Gross unrealized losses, total | (11.2) | (14.0)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 30.8 | 189.0
Gross unrealized losses, less than twelve months | (0.1) | (5.3)
Fair value, twelve months or greater | 871.7 | 784.8
Gross unrealized losses, twelve months or greater | (38.7) | (42.5)
Fair value, total | 902.5 | 973.8
Gross unrealized losses, total | (38.8) | (47.8)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 0.0 | 0.0
Gross unrealized losses, less than twelve months | 0.0 | 0.0
Fair value, twelve months or greater | 2.6 | 2.5
Gross unrealized losses, twelve months or greater | (0.2) | (0.2)
Fair value, total | 2.6 | 2.5
Gross unrealized losses, total | $ (0.2) | $ (0.2)

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