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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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