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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Fixed maturities: | $ 322.7 | $ 306.8
Cash equivalents | 349.5 | 342.4
Total assets at fair value | 672.2 | 649.2
U.S. Treasury securities and agencies |  |
Assets |  |
Fixed maturities: | 48.0 | 46.2
Municipal securities |  |
Assets |  |
Fixed maturities: | 22.3 | 23.5
Corporate debt securities |  |
Assets |  |
Fixed maturities: | 122.6 | 105.7
Asset-backed securities |  |
Assets |  |
Fixed maturities: | 126.3 | 116.6
Total fixed maturities |  |
Assets |  |
Fixed maturities: | 319.2 | 292.0
Short-term investments |  |
Assets |  |
Fixed maturities: | 3.5 | 14.8
Level 1 |  |
Assets |  |
Cash equivalents | 349.5 | 342.4
Total assets at fair value | 401.0 | 400.4
Level 1 | U.S. Treasury securities and agencies |  |
Assets |  |
Fixed maturities: | 48.0 | 46.2
Level 1 | Municipal securities |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 1 | Corporate debt securities |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 1 | Asset-backed securities |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 1 | Total fixed maturities |  |
Assets |  |
Fixed maturities: | 48.0 | 46.2
Level 1 | Short-term investments |  |
Assets |  |
Fixed maturities: | 3.5 | 11.8
Level 2 |  |
Assets |  |
Cash equivalents | 0.0 | 0.0
Total assets at fair value | 271.2 | 248.8
Level 2 | U.S. Treasury securities and agencies |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 2 | Municipal securities |  |
Assets |  |
Fixed maturities: | 22.3 | 23.5
Level 2 | Corporate debt securities |  |
Assets |  |
Fixed maturities: | 122.6 | 105.7
Level 2 | Asset-backed securities |  |
Assets |  |
Fixed maturities: | 126.3 | 116.6
Level 2 | Total fixed maturities |  |
Assets |  |
Fixed maturities: | 271.2 | 245.8
Level 2 | Short-term investments |  |
Assets |  |
Fixed maturities: | 0.0 | 3.0
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 |  |
Fixed maturities: | 0.0 | 0.0
Level 3 | Municipal securities |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 3 | Corporate debt securities |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 3 | Asset-backed securities |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 3 | Total fixed maturities |  |
Assets |  |
Fixed maturities: | 0.0 | 0.0
Level 3 | Short-term investments |  |
Assets |  |
Fixed maturities: | $ 0.0 | $ 0.0

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