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INVESTMENTS - Investments in Continuous Loss Position (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | $ 1,611.5 | $ 1,632.5
Gross unrealized losses, less than twelve months | (48.8) | (11.9)
Fair value, twelve months or greater | 58.8 | 0.0
Gross unrealized losses, twelve months or greater | (3.2) | 0.0
Fair value, total | 1,670.3 | 1,632.5
Gross unrealized losses, total | (52.0) | (11.9)
United States government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 101.8 | 85.1
Gross unrealized losses, less than twelve months | (3.6) | (0.7)
Fair value, twelve months or greater | 9.4 | 0.0
Gross unrealized losses, twelve months or greater | (0.4) | 0.0
Fair value, total | 111.2 | 85.1
Gross unrealized losses, total | (4.0) | (0.7)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 396.5 | 433.3
Gross unrealized losses, less than twelve months | (10.5) | (2.9)
Fair value, twelve months or greater | 15.8 | 0.0
Gross unrealized losses, twelve months or greater | (0.3) | 0.0
Fair value, total | 412.3 | 433.3
Gross unrealized losses, total | (10.8) | (2.9)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 1,110.1 | 1,114.1
Gross unrealized losses, less than twelve months | (34.5) | (8.3)
Fair value, twelve months or greater | 33.6 | 0.0
Gross unrealized losses, twelve months or greater | (2.5) | 0.0
Fair value, total | 1,143.7 | 1,114.1
Gross unrealized losses, total | (37.0) | $ (8.3)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 3.1 |
Gross unrealized losses, less than twelve months | (0.2) |
Fair value, twelve months or greater | 0.0 |
Gross unrealized losses, twelve months or greater | 0.0 |
Fair value, total | 3.1 |
Gross unrealized losses, total | $ (0.2) |

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