White Mountains Insurance Group
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White Mountains Insurance Group enjoys the tax-mild climate of Bermuda, but still slogs out winter in New Hampshire. The company provides insurance and reinsurance products and services through its US operating office's two main divisions: majority-owned OneBeacon Insurance (specialty and commercial property/casualty policies sold through independent agents in the US) and Sirius Group (domestic and international property/casualty insurance and reinsurance). In 2011 it sold its Esurance (personal auto insurance sold online) unit to Allstate in a deal worth about $1 billion.