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INVESTMENTS - Investments in Continuous Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | $ 1,541.4 | $ 1,632.5
Gross unrealized losses, less than twelve months | (62.1) | (11.9)
Fair value, twelve months or greater | 81.6 | 0.0
Gross unrealized losses, twelve months or greater | (5.5) | 0.0
Fair value, total | 1,623.0 | 1,632.5
Gross unrealized losses, total | (67.6) | (11.9)
United States government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 90.5 | 85.1
Gross unrealized losses, less than twelve months | (4.0) | (0.7)
Fair value, twelve months or greater | 14.0 | 0.0
Gross unrealized losses, twelve months or greater | (0.7) | 0.0
Fair value, total | 104.5 | 85.1
Gross unrealized losses, total | (4.7) | (0.7)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 385.5 | 433.3
Gross unrealized losses, less than twelve months | (13.3) | (2.9)
Fair value, twelve months or greater | 15.8 | 0.0
Gross unrealized losses, twelve months or greater | (0.4) | 0.0
Fair value, total | 401.3 | 433.3
Gross unrealized losses, total | (13.7) | (2.9)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 1,062.8 | 1,114.1
Gross unrealized losses, less than twelve months | (44.6) | (8.3)
Fair value, twelve months or greater | 51.8 | 0.0
Gross unrealized losses, twelve months or greater | (4.4) | 0.0
Fair value, total | 1,114.6 | 1,114.1
Gross unrealized losses, total | (49.0) | $ (8.3)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than twelve months | 2.6 |
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 | 2.6 |
Gross unrealized losses, total | $ (0.2) |

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