White Mountains Insurance Group Ltd operates in the Fire, marine, and casualty insurance sector. White Mountains Insurance Group, Ltd. is engaged in the businesses of property and casualty insurance and reinsurance, through its subsidiaries and affiliates. The Company's segments include OneBeacon, White Mountains Re and Other Operations. In October 2011, The Allstate Corporation acquired Esurance and Answer Financial from the Company. In October 2011, the Company announced the completion of the reorganization and rebranding of its global reinsurance business as the Sirius Group. On December 31, 2011, the Company, through its subsidiary, acquired Old Lyme Insurance Company Ltd. In
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