Acquisitions	3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions Brahmin Leather Works, LLC In October 2018, the Company acquired 90% of Brahmin Leather Works, LLC (Brahmin), a Massachusetts-based privately held creator of fashion leather handbags. Total consideration for the acquisition was $193.8 million, which included cash consideration of $173.3 million. Total consideration also includes the estimated fair value of contingent consideration the Company expects to pay based on Brahmin’s earnings as defined in the purchase agreement, for the period of 2019 through 2021. The purchase price has been preliminarily allocated to the acquired assets and liabilities of Brahmin based on estimated fair values at the acquisition date. The Company has preliminarily recognized goodwill of $63.9 million, which is primarily attributable to expected future earnings and cash flow potential of Brahmin. The majority of the goodwill recognized is expected to be deductible for income tax purposes. The Company also has preliminarily recognized other intangible assets of $90.3 million, which includes $54.0 million of customer relationships, $35.0 million of trade names and $1.3 million of other intangible assets, which are expected to be amortized over a weighted average period of 16 years, 16 years and 8 years, respectively. The Company also has recognized redeemable non-controlling interests of $19.6 million. Results attributable to Brahmin 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. These valuations will be completed within the measurement period, which cannot exceed 12 months from the acquisition date. As a result, the fair value recorded for these items is a provisional estimate and may be subject to further adjustment. Any adjustments resulting from the valuations may impact the individual amounts recorded for assets acquired and liabilities assumed, as well as the residual goodwill. Nephila Holdings Ltd. In November 2018, the Company acquired all of the outstanding shares of Nephila Holdings Ltd. (Nephila), a Bermuda-based investment fund manager offering a broad range of investment products, including insurance-linked securities, catastrophe bonds, insurance swaps and weather derivatives. Nephila generates revenue primarily through management and incentive fees. Total consideration for the acquisition was $970.9 million, all of which was cash consideration. The purchase price has been preliminarily allocated to the acquired assets and liabilities of Nephila based on estimated fair values at the acquisition date. The Company has preliminarily recognized goodwill of $460.0 million, which is primarily attributable to expected future earnings and cash flow potential of Nephila. None of the goodwill recognized is expected to be deductible for income tax purposes. The Company also has preliminarily recognized other intangible assets of $533.5 million, which includes $452.0 million of investment management agreements, $31.0 million of broker relationships, $27.0 million of technology and $23.5 million of trade names, which are expected to be amortized over a weighted average period of 16 years, 12 years, 6 years and 14 years, respectively. The Company also has recognized noncontrolling interests of $25.5 million attributable to certain consolidated subsidiaries of Nephila that are not wholly-owned. Nephila operates as a separate business unit and its operating results are not included in a reportable segment. The Company has not completed the process of determining the fair value of the assets acquired and liabilities assumed. These valuations will be completed within the measurement period, which cannot exceed 12 months from the acquisition date. As a result, the fair value recorded for these items is a provisional estimate and may be subject to further adjustment. Any adjustments resulting from the valuations may impact the individual amounts recorded for assets acquired and liabilities assumed, as well as the residual goodwill.

Acquisitions

Brahmin Leather Works, LLC

In October 2018, the Company acquired 90% of Brahmin Leather Works, LLC (Brahmin), a Massachusetts-based privately held creator of fashion leather handbags. Total consideration for the acquisition was $193.8 million, which included cash consideration of $173.3 million. Total consideration also includes the estimated fair value of contingent consideration the Company expects to pay based on Brahmin’s earnings as defined in the purchase agreement, for the period of 2019 through 2021. The purchase price has been preliminarily allocated to the acquired assets and liabilities of Brahmin based on estimated fair values at the acquisition date. The Company has preliminarily recognized goodwill of $63.9 million, which is primarily attributable to expected future earnings and cash flow potential of Brahmin. The majority of the goodwill recognized is expected to be deductible for income tax purposes. The Company also has preliminarily recognized other intangible assets of $90.3 million, which includes $54.0 million of customer relationships, $35.0 million of trade names and $1.3 million of other intangible assets, which are expected to be amortized over a weighted average period of 16 years, 16 years and 8 years, respectively. The Company also has recognized redeemable non-controlling interests of $19.6 million. Results attributable to Brahmin 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. These valuations will be completed within the measurement period, which cannot exceed 12 months from the acquisition date. As a result, the fair value recorded for these items is a provisional estimate and may be subject to further adjustment. Any adjustments resulting from the valuations may impact the individual amounts recorded for assets acquired and liabilities assumed, as well as the residual goodwill.

Nephila Holdings Ltd.

In November 2018, the Company acquired all of the outstanding shares of Nephila Holdings Ltd. (Nephila), a Bermuda-based investment fund manager offering a broad range of investment products, including insurance-linked securities, catastrophe bonds, insurance swaps and weather derivatives. Nephila generates revenue primarily through management and incentive fees. Total consideration for the acquisition was $970.9 million, all of which was cash consideration. The purchase price has been preliminarily allocated to the acquired assets and liabilities of Nephila based on estimated fair values at the acquisition date. The Company has preliminarily recognized goodwill of $460.0 million, which is primarily attributable to expected future earnings and cash flow potential of Nephila. None of the goodwill recognized is expected to be deductible for income tax purposes. The Company also has preliminarily recognized other intangible assets of $533.5 million, which includes $452.0 million of investment management agreements, $31.0 million of broker relationships, $27.0 million of technology and $23.5 million of trade names, which are expected to be amortized over a weighted average period of 16 years, 12 years, 6 years and 14 years, respectively. The Company also has recognized noncontrolling interests of $25.5 million attributable to certain consolidated subsidiaries of Nephila that are not wholly-owned. Nephila operates as a separate business unit and its operating results are not included in a reportable segment.