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INVESTMENTS - Schedule of Amortized Cost and Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 320.4 | $ 309.1
Allowance for Expected Credit Losses | 0.0 | 0.0
Gross Unrealized Gains | 3.3 | 0.8
Gross Unrealized Losses | (1.0) | (3.1)
Fair Value | 322.7 | 306.8
U.S. Treasury securities and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 47.4 | 46.5
Allowance for Expected Credit Losses | 0.0 | 0.0
Gross Unrealized Gains | 0.7 | 0.0
Gross Unrealized Losses | (0.1) | (0.3)
Fair Value | 48.0 | 46.2
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 22.3 | 23.9
Allowance for Expected Credit Losses | 0.0 | 0.0
Gross Unrealized Gains | 0.2 | 0.1
Gross Unrealized Losses | (0.2) | (0.5)
Fair Value | 22.3 | 23.5
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 121.7 | 106.6
Allowance for Expected Credit Losses | 0.0 | 0.0
Gross Unrealized Gains | 1.3 | 0.3
Gross Unrealized Losses | (0.4) | (1.2)
Fair Value | 122.6 | 105.7
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 125.5 | 117.3
Allowance for Expected Credit Losses | 0.0 | 0.0
Gross Unrealized Gains | 1.1 | 0.4
Gross Unrealized Losses | (0.3) | (1.1)
Fair Value | 126.3 | 116.6
Total fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 316.9 | 294.3
Allowance for Expected Credit Losses | 0.0 | 0.0
Gross Unrealized Gains | 3.3 | 0.8
Gross Unrealized Losses | (1.0) | (3.1)
Fair Value | 319.2 | 292.0
Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3.5 | 14.8
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 | $ 3.5 | $ 14.8

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- 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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