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Fair Value Measurement (Narrative) (Details) | Mar. 31, 2024 USD ($) subsidiary | Dec. 31, 2023 USD ($)
--- | --- | ---
Credit Derivatives [Line Items] |  |
Number of proassurance's insurance subsidiaries | subsidiary | 3 |
Fair value of funded deferred compensation assets | $ 33,800,000 | $ 32,300,000
Fair Value |  |
Credit Derivatives [Line Items] |  |
Deferred compensation liabilities | 33,500,000 | 32,000,000
Fair Value, Nonrecurring |  |
Credit Derivatives [Line Items] |  |
Fair value, net asset (liability) | $ 0 | $ 0

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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