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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
AFS securities | $ 139.3 | $ 224.0
Cash equivalents | 485.7 | 568.4
Total assets at fair value | 625.0 | 792.4
U.S. Treasury securities and agencies |  |
Assets |  |
AFS securities | 16.0 | 17.0
Municipal securities |  |
Assets |  |
AFS securities | 20.5 | 23.4
Corporate debt securities |  |
Assets |  |
AFS securities | 51.7 | 90.5
Residential mortgage-backed securities |  |
Assets |  |
AFS securities | 6.1 | 7.8
Commercial mortgage backed securities |  |
Assets |  |
AFS securities | 31.9 | 58.4
Other debt obligations |  |
Assets |  |
AFS securities | 10.1 | 23.9
Total fixed maturities |  |
Assets |  |
AFS securities | 136.3 | 221.0
Short-term investments |  |
Assets |  |
AFS securities | 3.0 | 3.0
Level 1 |  |
Assets |  |
Cash equivalents | 485.7 | 568.4
Total assets at fair value | 503.9 | 587.6
Level 1 | U.S. Treasury securities and agencies |  |
Assets |  |
AFS securities | 16.0 | 17.0
Level 1 | Municipal securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 1 | Corporate debt securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 1 | Residential mortgage-backed securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 1 | Commercial mortgage backed securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 1 | Other debt obligations |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 1 | Total fixed maturities |  |
Assets |  |
AFS securities | 16.0 | 17.0
Level 1 | Short-term investments |  |
Assets |  |
AFS securities | 2.2 | 2.2
Level 2 |  |
Assets |  |
Cash equivalents | 0.0 | 0.0
Total assets at fair value | 121.1 | 204.8
Level 2 | U.S. Treasury securities and agencies |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 2 | Municipal securities |  |
Assets |  |
AFS securities | 20.5 | 23.4
Level 2 | Corporate debt securities |  |
Assets |  |
AFS securities | 51.7 | 90.5
Level 2 | Residential mortgage-backed securities |  |
Assets |  |
AFS securities | 6.1 | 7.8
Level 2 | Commercial mortgage backed securities |  |
Assets |  |
AFS securities | 31.9 | 58.4
Level 2 | Other debt obligations |  |
Assets |  |
AFS securities | 10.1 | 23.9
Level 2 | Total fixed maturities |  |
Assets |  |
AFS securities | 120.3 | 204.0
Level 2 | Short-term investments |  |
Assets |  |
AFS securities | 0.8 | 0.8
Level 3 |  |
Assets |  |
Cash equivalents | 0.0 | 0.0
Total assets at fair value | 0.0 | 0.0
Level 3 | U.S. Treasury securities and agencies |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 3 | Municipal securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 3 | Corporate debt securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 3 | Residential mortgage-backed securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 3 | Commercial mortgage backed securities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 3 | Other debt obligations |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 3 | Total fixed maturities |  |
Assets |  |
AFS securities | 0.0 | 0.0
Level 3 | Short-term investments |  |
Assets |  |
AFS securities | $ 0.0 | $ 0.0

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