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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets
AFS securities	$ 134.7	$ 224.0
Cash equivalents	336.5	568.4
Total assets at fair value	471.2	792.4
U.S. Treasury securities and agencies
Assets
AFS securities	21.6	17.0
Municipal securities
Assets
AFS securities	20.4	23.4
Corporate debt securities
Assets
AFS securities	50.7	90.5
Residential mortgage-backed securities
Assets
AFS securities	4.8	7.8
Commercial mortgage backed securities
Assets
AFS securities	30.2	58.4
Other debt obligations
Assets
AFS securities	6.7	23.9
Total fixed maturities
Assets
AFS securities	134.4	221.0
Short-term investments
Assets
AFS securities	0.3	3.0
Level 1
Assets
Cash equivalents	336.5	568.4
Total assets at fair value	358.1	587.6
Level 1 | U.S. Treasury securities and agencies
Assets
AFS securities	21.6	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	21.6	17.0
Level 1 | Short-term investments
Assets
AFS securities	0.0	2.2
Level 2
Assets
Cash equivalents	0.0	0.0
Total assets at fair value	113.1	204.8
Level 2 | U.S. Treasury securities and agencies
Assets
AFS securities	0.0	0.0
Level 2 | Municipal securities
Assets
AFS securities	20.4	23.4
Level 2 | Corporate debt securities
Assets
AFS securities	50.7	90.5
Level 2 | Residential mortgage-backed securities
Assets
AFS securities	4.8	7.8
Level 2 | Commercial mortgage backed securities
Assets
AFS securities	30.2	58.4
Level 2 | Other debt obligations
Assets
AFS securities	6.7	23.9
Level 2 | Total fixed maturities
Assets
AFS securities	112.8	204.0
Level 2 | Short-term investments
Assets
AFS securities	0.3	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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