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Investments - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) security | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) security | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Gross unrealized losses | $ 3.6 |  | $ 3.6 |  | $ 6.3
Realized investment gains (losses) | 0.1 | $ (0.1) | 0.1 | $ (0.1) |
Gross unrealized losses, twelve months or more | $ 2.5 |  | $ 2.5 |  | $ 4.9
Number of debt securities held, unrealized loss position | security | 241 |  | 241 |  |
Allowance for credit losses | $ 0.0 |  | $ 0.0 |  |
Restricted investments | $ 84.5 |  | $ 84.5 |  |

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- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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