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INVESTMENTS - Investments in Continuous Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | $ 1,241.7 | $ 1,632.5
Gross unrealized losses, less than twelve months | (48.0) | (11.9)
Fair value, twelve months or greater | 393.2 | 0.0
Gross unrealized losses, twelve months or greater | (30.0) | 0.0
Fair value, total | 1,634.9 | 1,632.5
Gross unrealized losses, total | (78.0) | (11.9)
United States government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 102.5 | 85.1
Gross unrealized losses, less than twelve months | (4.6) | (0.7)
Fair value, twelve months or greater | 33.3 | 0.0
Gross unrealized losses, twelve months or greater | (2.2) | 0.0
Fair value, total | 135.8 | 85.1
Gross unrealized losses, total | (6.8) | (0.7)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 287.8 | 433.3
Gross unrealized losses, less than twelve months | (6.0) | (2.9)
Fair value, twelve months or greater | 138.7 | 0.0
Gross unrealized losses, twelve months or greater | (9.1) | 0.0
Fair value, total | 426.5 | 433.3
Gross unrealized losses, total | (15.1) | (2.9)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 848.9 | 1,114.1
Gross unrealized losses, less than twelve months | (37.1) | (8.3)
Fair value, twelve months or greater | 221.2 | 0.0
Gross unrealized losses, twelve months or greater | (18.7) | 0.0
Fair value, total | 1,070.1 | 1,114.1
Gross unrealized losses, total | (55.8) | $ (8.3)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 2.5 |
Gross unrealized losses, less than twelve months | (0.3) |
Fair value, twelve months or greater | 0.0 |
Gross unrealized losses, twelve months or greater | 0.0 |
Fair value, total | 2.5 |
Gross unrealized losses, total | $ (0.3) |

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