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INVESTMENTS - Amortized Cost and Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 132.9	$ 129.5
Allowance for Expected Credit Losses	0.0	0.0
Gross Unrealized Gains	0.1	1.2
Gross Unrealized Losses	(3.4)	(0.8)
Fair Value	129.6	129.9
U.S. Treasury securities and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23.7	23.7
Allowance for Expected Credit Losses	0.0	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.6)	(0.4)
Fair Value	23.1	23.3
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20.4	20.4
Allowance for Expected Credit Losses	0.0	0.0
Gross Unrealized Gains	0.0	0.3
Gross Unrealized Losses	(0.7)	(0.1)
Fair Value	19.7	20.6
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49.9	48.2
Allowance for Expected Credit Losses	0.0	0.0
Gross Unrealized Gains	0.1	0.7
Gross Unrealized Losses	(1.3)	(0.2)
Fair Value	48.7	48.7
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2.9	3.5
Allowance for Expected Credit Losses	0.0	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	0.0
Fair Value	2.7	3.5
Commercial mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	32.5	30.2
Allowance for Expected Credit Losses	0.0	0.0
Gross Unrealized Gains	0.0	0.2
Gross Unrealized Losses	(0.6)	(0.1)
Fair Value	31.9	30.3
Other debt obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3.0	3.5
Allowance for Expected Credit Losses	0.0	0.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	3.0	3.5
Total fixed maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	132.4
Allowance for Expected Credit Losses	0.0
Gross Unrealized Gains	0.1
Gross Unrealized Losses	(3.4)
Fair Value	129.1	$ 129.9
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0.5
Allowance for Expected Credit Losses	0.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	$ 0.5

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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