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Investments (Narrative) (Details) £ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2024 USD ($) | Apr. 30, 2023 USD ($) | Jun. 30, 2025 USD ($) shares | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) shares | Jun. 30, 2024 USD ($) | Jun. 30, 2025 GBP (£) shares | Dec. 31, 2024 USD ($) shares
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Money Market Investments |  |  | $ 6,000,000.0 |  | $ 6,000,000.0 |  |  | $ 3,900,000
Marketable equity securities |  |  | 889,515,000 |  | 889,515,000 |  |  | 852,434,000
Payments to Acquire Marketable Securities |  |  |  |  | 4,823,000 | $ 0 |  |
Proceeds from sales of marketable equity securities |  |  |  |  | 0 | 0 |  |
Cumulative realized gain (loss) on marketable securities |  |  |  |  |  | 400,000 |  |
Payments for Advance to Affiliate |  |  |  |  | 0 | 2,000,000 |  |
Cumulative undistributed income in investments in affiliates |  |  | 30,600,000 |  | 30,600,000 |  |  | 38,000,000.0
Cost method investments |  |  | 62,400,000 |  | 62,400,000 |  |  | $ 74,800,000
Impairment of cost method investments |  |  | 12,679,000 | $ 338,000 | $ 12,679,000 | 744,000 |  |
Concentration in single marketable equity security [Member] | Assets, Total [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Minimum percentage of total assets considered as significant concentrations |  |  |  |  | 5.00% |  |  |
Related Party [Member] | Graham Healthcare Group [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Operating Revenues |  |  | $ 4,100,000 | $ 4,400,000 | $ 7,900,000 | $ 8,500,000 |  |
Markel Corporation [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Number of Shares Held in Investment | shares |  |  | 55,430 |  | 55,430 |  | 55,430 | 55,430
Marketable equity securities |  |  | $ 110,700,000 |  | $ 110,700,000 |  |  | $ 95,700,000
Berkshire Hathaway [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Marketable equity securities |  |  | $ 542,200,000 |  | $ 542,200,000 |  |  |
Berkshire Hathaway [Member] | Common Class A [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Number of Shares Held in Investment | shares |  |  | 422 |  | 422 |  | 422 |
Berkshire Hathaway [Member] | Common Class B [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Number of Shares Held in Investment | shares |  |  | 482,945 |  | 482,945 |  | 482,945 |
Residential Home Health Illinois [Member] | Graham Healthcare Group [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 40.00% |  | 40.00% |  | 40.00% |
Residential Hospice Illinois [Member] | Graham Healthcare Group [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 40.00% |  | 40.00% |  | 40.00% |
Mary Free Bed at Home [Member] | Graham Healthcare Group [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 40.00% |  | 40.00% |  | 40.00% |
Allegheny Health Network (AHN) Healthcare at Home [Member] | Graham Healthcare Group [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 40.00% |  | 40.00% |  | 40.00% |
Intersection Holdings [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 18.00% |  | 18.00% |  | 18.00% |
Payments for Advance to Affiliate |  | $ 30,000,000.0 |  |  |  |  |  |
Loan Receivable, Payment Terms |  |  |  |  | 5 years |  |  |
Loan Receivable Fixed Interest Rate |  |  |  |  | 9.00% |  |  |
Advances to Affiliate |  |  | $ 24,300,000 |  | $ 24,300,000 |  |  |
N2K Networks [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Payments for Advance to Affiliate | $ 2,000,000.0 |  |  |  |  |  |  |
Loan Receivable Fixed Interest Rate | 12.00% |  |  |  |  |  |  |
Equity Method Investment, Diluted Ownership Percentage |  |  | 50.40% |  | 50.40% |  | 50.40% |
Realm [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Diluted Ownership Percentage |  |  | 41.40% |  | 41.40% |  | 41.40% |
York Joint Venture [Member] | KIHL [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 45.00% |  | 45.00% |  | 45.00% |
Loan Receivable, Payment Terms |  |  |  |  | 25 years |  |  |
Loan Receivable Fixed Interest Rate |  |  |  |  | 7.00% |  |  |
Advances to Affiliate | £ |  |  |  |  |  |  | £ 19.3 |
Cumulative payments for advance to affiliate | £ |  |  |  |  |  |  | £ 22.0 |

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