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INVESTMENTS - Amortized Cost and Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Total	$ 137.2	$ 218.4
Gross Unrealized Gains	2.4	5.7
Gross Unrealized Losses	(0.3)	(0.1)
Fair Value	139.3	224.0
U.S. Treasury securities and agencies
Debt Securities, Available-for-sale [Line Items]
Total	16.0	16.9
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(0.1)	0.0
Fair Value	16.0	17.0
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Total	20.0	22.6
Gross Unrealized Gains	0.5	0.8
Gross Unrealized Losses	0.0	0.0
Fair Value	20.5	23.4
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total	50.6	87.5
Gross Unrealized Gains	1.2	3.1
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	51.7	90.5
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	6.2	7.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Fair Value	6.1	7.8
Commercial mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Total	31.4	57.1
Gross Unrealized Gains	0.5	1.3
Gross Unrealized Losses	0.0	0.0
Fair Value	31.9	58.4
Other debt obligations
Debt Securities, Available-for-sale [Line Items]
Total	10.0	23.5
Gross Unrealized Gains	0.1	0.4
Gross Unrealized Losses	0.0	0.0
Fair Value	10.1	23.9
Total fixed maturities
Debt Securities, Available-for-sale [Line Items]
Total	134.2	215.4
Gross Unrealized Gains	2.4	5.7
Gross Unrealized Losses	(0.3)	(0.1)
Fair Value	136.3	221.0
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Total	3.0	3.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 3.0	$ 3.0

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