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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets
AFS securities	$ 129.6	$ 129.9
Cash equivalents	124.1	127.0
Total assets at fair value	253.7	256.9
U.S. Treasury securities and agencies
Assets
AFS securities	23.1	23.3
Municipal securities
Assets
AFS securities	19.7	20.6
Corporate debt securities
Assets
AFS securities	48.7	48.7
Residential mortgage-backed securities
Assets
AFS securities	2.7	3.5
Commercial mortgage backed securities
Assets
AFS securities	31.9	30.3
Other debt obligations
Assets
AFS securities	3.0	3.5
Total fixed maturities
Assets
AFS securities	129.1	129.9
Short-term investments
Assets
AFS securities	0.5
Level 1
Assets
Cash equivalents	124.1	127.0
Total assets at fair value	146.4	149.6
Level 1 | U.S. Treasury securities and agencies
Assets
AFS securities	22.3	22.6
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	22.3	22.6
Level 1 | Short-term investments
Assets
AFS securities	0.0
Level 2
Assets
Cash equivalents	0.0	0.0
Total assets at fair value	107.3	107.3
Level 2 | U.S. Treasury securities and agencies
Assets
AFS securities	0.8	0.7
Level 2 | Municipal securities
Assets
AFS securities	19.7	20.6
Level 2 | Corporate debt securities
Assets
AFS securities	48.7	48.7
Level 2 | Residential mortgage-backed securities
Assets
AFS securities	2.7	3.5
Level 2 | Commercial mortgage backed securities
Assets
AFS securities	31.9	30.3
Level 2 | Other debt obligations
Assets
AFS securities	3.0	3.5
Level 2 | Total fixed maturities
Assets
AFS securities	106.8	107.3
Level 2 | Short-term investments
Assets
AFS securities	0.5
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

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