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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 |

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