Acquisitions and Dispositions	3 Months Ended
Mar. 31, 2025
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions and Dispositions	Acquisitions Educational Partners International In September 2024, the Company acquired a 68% ownership interest in Educational Partners International (EPI), a company that sponsors international teachers for placements in schools in the U.S. Total consideration for the Company's investment was $167.7 million, all of which was cash. The Company has the option to acquire the remaining equity interests and the remaining equity holders have the option to sell their interests to the Company in the future. Through January 15, 2025, the Company's investment was accounted for under the equity method, as the Company did not have control over the business due to regulatory approval that was still pending. On January 16, 2025, the Company received regulatory approval, which resulted in the control and consolidation of EPI. The fair value of the investment on the consolidation date was preliminarily allocated to the acquired assets and liabilities of EPI based on estimated fair value at the consolidation date. The Company recognized goodwill of $70.3 million, intangible assets of $177.0 million and redeemable noncontrolling interest of $81.2 million. Goodwill is primarily attributable to expected future earnings and cash flow potential of EPI, and it is expected to be deductible for income tax purposes. The primary intangible asset acquired is an indefinite-lived intangible asset for a designation from the U.S. Department of State that authorizes EPI to sponsor international teachers for placements in schools in the U.S. Results attributable to EPI are included in the Company's Markel Ventures segment. The Company has not completed the process of determining the fair value of the assets acquired and liabilities assumed. As a result, the fair value recorded for these items is a provisional estimate and is subject to adjustment. Once completed, any adjustments resulting from the valuations may impact the individual amounts recorded for assets acquired and liabilities assumed, as well as the residual goodwill. Valor Environmental In June 2024, the Company acquired 98% of Valor Environmental (Valor), an environmental services company providing erosion control and related services to commercial development sites and homebuilders throughout the United States. The Company has the option to acquire the remaining equity interests and the remaining equity holders have the option to sell their interests to the Company in the future. Total consideration for the transaction was $156.4 million, all of which was cash. As of June 30, 2024, the purchase price was preliminarily allocated to the acquired assets and liabilities of Valor based on estimated fair value at the acquisition date. In the first quarter of 2025, the Company completed the process of determining the fair value of the assets acquired and liabilities assumed with Valor and recognized goodwill of $73.4 million and intangible assets of $92.5 million. The final purchase price allocation reflected differences from the preliminary purchase price allocation, including a $43.5 million increase in the amount recognized for intangible assets upon completion of a third-party valuation and an increase in the corresponding deferred tax liability. The final purchase price allocation adjustments resulted in a $34.2 million net decrease to goodwill from the preliminary amount recognized. Goodwill is primarily attributable to expected future earnings and cash flow potential of Valor, and a portion of it is not deductible for income tax purposes. Intangible assets include $82.0 million of customer relationships, $6.0 million of trade names and $4.5 million of other intangible assets, which are being amortized over 17 years, 15 years and 5 years, respectively. Results attributable to Valor are included in the Company's Markel Ventures segment.

In September 2024, the Company acquired a 68% ownership interest in Educational Partners International (EPI), a company that sponsors international teachers for placements in schools in the U.S. Total consideration for the Company's investment was $167.7 million, all of which was cash. The Company has the option to acquire the remaining equity interests and the remaining equity holders have the option to sell their interests to the Company in the future. Through January 15, 2025, the Company's investment was accounted for under the equity method, as the Company did not have control over the business due to regulatory approval that was still pending. On January 16, 2025, the Company received regulatory approval, which resulted in the control and consolidation of EPI. The fair value of the investment on the consolidation date was preliminarily allocated to the acquired assets and liabilities of EPI based on estimated fair value at the consolidation date. The Company recognized goodwill of $70.3 million, intangible assets of $177.0 million and redeemable noncontrolling interest of $81.2 million. Goodwill is primarily attributable to expected future earnings and cash flow potential of EPI, and it is expected to be deductible for income tax purposes. The primary intangible asset acquired is an indefinite-lived intangible asset for a designation from the U.S. Department of State that authorizes EPI to sponsor international teachers for placements in schools in the U.S. Results attributable to EPI are included in the Company's Markel Ventures segment.

The Company has not completed the process of determining the fair value of the assets acquired and liabilities assumed. As a result, the fair value recorded for these items is a provisional estimate and is subject to adjustment. Once completed, any adjustments resulting from the valuations may impact the individual amounts recorded for assets acquired and liabilities assumed, as well as the residual goodwill.

In June 2024, the Company acquired 98% of Valor Environmental (Valor), an environmental services company providing erosion control and related services to commercial development sites and homebuilders throughout the United States. The Company has the option to acquire the remaining equity interests and the remaining equity holders have the option to sell their interests to the Company in the future. Total consideration for the transaction was $156.4 million, all of which was cash.

As of June 30, 2024, the purchase price was preliminarily allocated to the acquired assets and liabilities of Valor based on estimated fair value at the acquisition date. In the first quarter of 2025, the Company completed the process of determining the fair value of the assets acquired and liabilities assumed with Valor and recognized goodwill of $73.4 million and intangible assets of $92.5 million. The final purchase price allocation reflected differences from the preliminary purchase price allocation, including a $43.5 million increase in the amount recognized for intangible assets upon completion of a third-party valuation and an increase in the corresponding deferred tax liability. The final purchase price allocation adjustments resulted in a $34.2 million net decrease to goodwill from the preliminary amount recognized. Goodwill is primarily attributable to expected future earnings and cash flow potential of Valor, and a portion of it is not deductible for income tax purposes. Intangible assets include $82.0 million of customer relationships, $6.0 million of trade names and $4.5 million of other intangible assets, which are being amortized over 17 years, 15 years and 5 years, respectively. Results attributable to Valor are included in the Company's Markel Ventures segment.