2.2.0.25falsefalse1010 - Disclosure - Summary of Significant Accounting Policiestruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $D2011Q1http://www.sec.gov/CIK0001165880duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0mrh_SummaryOfSignificantAccountingPoliciesDisclosureAbstractmrhfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseSummary of Significant Accounting Policies3false0mrh_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlockmrhfalsenadurationDescription containing the entire organization, consolidation and basis of presentation of financial statements disclosure....falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00<table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <div style="BORDER-BOTTOM: white 1pt solid; BORDER-LEFT: white 1pt solid; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: white 1pt solid; BORDER-RIGHT: white 1pt solid; PADDING-TOP: 0in"> <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">NOTE 1.  Summary of Significant Accounting Policies <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Basis of Presentation <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Montpelier Re Holdings Ltd. (the Company or the Registrant) was incorporated as an exempted Bermuda limited liability company under the laws of Bermuda on November 14, 2001.  The Company, through its subsidiaries in Bermuda, the United States (the U.S.), the United Kingdom (the U.K.) and Switzerland (collectively Montpelier), provides customized and innovative insurance and reinsurance solutions to the global market.  The Companys headquarters and principal executive offices are located at Montpelier House, 94 Pitts Bay Road Pembroke, Bermuda HM 08. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The Company currently operates through three reportable segments: Montpelier Bermuda, Montpelier Syndicate 5151 and Montpelier U.S. Insurance Company (MUSIC).  Each segment is a separate underwriting platform through which the Company writes insurance and reinsurance business. The segment disclosures provided herein present the operations of Montpelier Bermuda, Montpelier Syndicate 5151 and MUSIC prior to the effects of intercompany quota share reinsurance agreements among them. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Detailed financial information about each of the Companys reportable segments for the three months ended March 31, 2011 and 2010 is presented in Note 9. The activities of the Company, certain of its intermediate holding and service companies and intercompany eliminations relating to inter-segment reinsurance and support services, collectively referred to as Corporate and Other, are also presented in Note 9. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The nature and composition of each of the Companys reportable segments and its Corporate and Other activities are as follows: <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Montpelier Bermuda <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The Montpelier Bermuda segment consists of the assets and operations of Montpelier Reinsurance Ltd. (Montpelier Re), the Companys wholly-owned operating subsidiary based in Pembroke, Bermuda. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Montpelier Re is registered in Bermuda as a Class 4 insurer, meaning that Montpelier Re is subject to the most stringent capital and solvency margin requirements within Bermudas regulatory environment.  Montpelier Re seeks to identify and underwrite attractive insurance and reinsurance opportunities by combining underwriting experience with proprietary risk pricing and capital allocation models and catastrophe modeling tools.</div>   <div style="BORDER-BOTTOM: white 1pt solid; BORDER-LEFT: white 1pt solid; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: white 1pt solid; BORDER-RIGHT: white 1pt solid; PADDING-TOP: 0in"> <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Montpelier Syndicate 5151 <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The Montpelier Syndicate 5151 segment consists of the collective assets and operations of Montpelier Syndicate 5151 (Syndicate 5151), Montpelier Capital Limited (MCL), Montpelier Underwriting Agencies Limited (MUAL), Montpelier Underwriting Services Limited (MUSL), Montpelier Underwriting Inc. (MUI), Montpelier Europa AG (MEAG) and Paladin Underwriting Agency Limited (PUAL). <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Syndicate 5151, the Companys wholly-owned Lloyds of London (Lloyds) syndicate based in London, was established in July 2007. Syndicate 5151 underwrites insurance and reinsurance sourced mainly from the London, U.S. and European markets. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">MCL, the Companys wholly-owned U.K. subsidiary based in London, serves as Syndicate 5151s sole corporate member.</div>   <div style="BORDER-BOTTOM: white 1pt solid; BORDER-LEFT: white 1pt solid; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: white 1pt solid; BORDER-RIGHT: white 1pt solid; PADDING-TOP: 0in"> <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">MUAL, the Companys wholly-owned Lloyds Managing Agent based in London, provides management services to Syndicate 5151. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">MUSL, the Companys wholly-owned U.K. subsidiary based in London, provides support services to Syndicate 5151 and MUAL. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">MUI, MEAG and PUAL serve as the Companys wholly-owned Lloyds Coverholders.  Each Coverholder is authorized to enter into contracts of insurance and reinsurance and/or issue documentation on behalf of Syndicate 5151. MUI, the Companys wholly-owned U.S. subsidiary based in Hartford, Connecticut, underwrites reinsurance business on behalf of Syndicate 5151 through managing general agents and intermediaries.  MEAG, the Companys wholly-owned Swiss subsidiary based in Baar, Canton Zug, Switzerland, focuses on marketing activities in Continental Europe and the Middle East on behalf of Syndicate 5151 and Montpelier Re.  PUAL, the Companys wholly-owned U.K. subsidiary based in London, was formed in 2009 and underwrites business on behalf of both Syndicate 5151 and third parties. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">MUSIC <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The MUSIC segment consists of the assets and operations of MUSIC, the Companys wholly-owned U.S. operating subsidiary based in Scottsdale, Arizona. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">MUSIC is an Oklahoma domiciled domestic surplus lines insurer and is authorized as an excess and surplus lines insurer in 47 additional states and the District of Columbia.  MUSIC underwrites smaller commercial property and casualty risks that do not conform to standard insurance lines. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Corporate and Other <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The Companys Corporate and Other activities consist of the assets and operations of the Company and certain of its intermediate holding and service companies, including Montpelier Technical Resources Ltd. (MTR). <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">MTR, the Companys wholly-owned U.S. subsidiary with its main offices in Woburn, Massachusetts and Hanover, New Hampshire, provides accounting, finance, legal, risk management, information technology, internal audit, human resources and advisory services to many of the Companys subsidiaries. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X.  Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. This report on Form 10-Q should be read in conjunction with the Companys Annual Report on Form 10-K for the year ended December 31, 2010, as filed with the Securities and Exchange Commission. In the opinion of management, these interim financial statements include all normally recurring adjustments considered necessary to fairly present the Companys financial position, results of operations and cash flows. All significant intercompany accounts and transactions have been eliminated in consolidation. These interim financial statements may not be indicative of financial results for the full year. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the period. Actual results could differ materially from those estimates. The major estimates reflected in the Companys unaudited consolidated financial statements include, but are not limited to, loss and loss adjustment expense (LAE) reserves, written and earned insurance and reinsurance premiums, ceded reinsurance and share-based compensation. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Insurance and Reinsurance Premiums and Related Costs <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Reinsurance contracts can be written on a risks-attaching or losses-occurring basis. Under risks-attaching reinsurance contracts, all claims from cedants underlying policies incepting during the contract period are covered, even if they occur after the expiration date of the reinsurance contract. In contrast, losses-occurring reinsurance contracts cover all claims occurring during the period of the contract, regardless of the inception dates of the underlying policies. Any claims occurring after the expiration of the losses-occurring contract are not covered.</div>   <div style="BORDER-BOTTOM: white 1pt solid; BORDER-LEFT: white 1pt solid; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: white 1pt solid; BORDER-RIGHT: white 1pt solid; PADDING-TOP: 0in"> <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Premiums written are recognized as revenues, net of any applicable underlying reinsurance coverage, and are earned over the term of the related policy or contract.  For direct insurance, and facultative and losses-occurring contracts, the earnings period is the same as the reinsurance contract. For risks-attaching contracts, the earnings period is based on the terms of the underlying insurance policies. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">For contracts that have a risk period of three years or less, the premiums are earned ratably over the term. For the relatively few contracts with risk periods greater than three years, premiums are earned in accordance with predetermined schedules that reflect the level of risk associated with each period in the contract term. These schedules are reviewed periodically and are adjusted as deemed necessary. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">For the majority of Montpeliers excess-of-loss contracts, written premium is based on the deposit or minimum premium as defined in the contract. Subsequent adjustments, based on reports of actual premium or revisions in estimates by ceding companies, are recorded in the period in which they are determined.  For Montpeliers pro-rata contracts and excess-of-loss contracts where no deposit or minimum premium is specified in the contract, written premium is recognized based on estimates of ultimate premiums provided by ceding companies and Montpeliers underwriters. Initial estimates of written premium are recognized in the period in which the underlying risks incept. Subsequent adjustments, based on reports of actual premium by the ceding companies, or revisions in estimates, are recorded in the period in which they are determined. Unearned premiums represent the portion of premiums written that are applicable to future insurance or reinsurance coverage provided by policies or contracts in force. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Premiums receivable are recorded at amounts due less any provision for doubtful accounts.  As of March 31, 2011 and December 31, 2010, Montpeliers provision for doubtful accounts was $3.0 million. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">When a reinsurance contract provides for a reinstatement of coverage following a covered loss, the associated reinstatement premium is recorded as both written and earned when Montpelier determines that such a loss event has occurred. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Deferred acquisition costs are comprised of commissions, brokerage costs, premium taxes and excise taxes, each of which relates directly to the writing of insurance and reinsurance contracts. These deferred acquisition costs are generally amortized over the underlying risk period of the related contracts. However, if the sum of a contracts expected losses and LAE, and deferred acquisition costs exceeds related unearned premiums and projected investment income, a premium deficiency is determined to exist. In this event, deferred acquisition costs are immediately expensed to the extent necessary to eliminate the premium deficiency.  If the premium deficiency exceeds deferred acquisition costs then a liability is accrued for the excess deficiency. There were no significant premium deficiency adjustments recorded in the three months ended March 31, 2011 or 2010. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Also included in acquisition costs are profit commissions incurred. Accrued profit commissions are included in insurance and reinsurance balances payable. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 0.15in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Foreign Currency Exchange <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The U.S. dollar is the Companys reporting currency.  The British pound is the functional currency for the operations of Syndicate 5151, MUAL, PUAL, MCL and MUSL and the Swiss franc is the functional currency for the operations of MEAG. The U.S. dollar is the functional currency for all other operations. The assets and liabilities of these foreign operations are converted to U.S. dollars at exchange rates in effect at the balance sheet date, and the related revenues and expenses are converted using average exchange rates for the period. Net foreign exchange gains and losses arising from translating these foreign operations to U.S. dollars are reported as a separate component of shareholders equity as translation gains and losses, with changes therein reported as a component of other comprehensive income. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The following rates of exchange to the U.S. dollar were used to translate the results of the Companys U.K. and Swiss operations:</div>   <table style="WIDTH: 100%; BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr style="HEIGHT: 0px"> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 41%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" valign="bottom" width="41%"> Currency</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" valign="bottom" width="12%"> Closing Rate March 31, 2011</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" valign="bottom" width="12%"> Opening Rate  January 1, 2011</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" valign="bottom" width="12%"> Closing Rate March 31, 2010</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" valign="bottom" width="12%"> Opening Rate  January 1, 2010</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="1%">  </td></tr> <tr style="HEIGHT: 0px"> <td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 41%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="41%"> British Pound (GBP)</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="12%"> 1.6002</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="12%"> 1.5441</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="12%"> 1.5074</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="12%"> 1.5948</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in" bgcolor="#CCEEFF" valign="bottom" width="1%">  </td></tr> <tr style="HEIGHT: 0px"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 41%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="41%"> Swiss Franc (CHF)</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="12%"> 1.0875</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="12%"> 1.0429</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="12%"> 0.9381</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.5%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="12%"> 0.9647</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1%; PADDING-RIGHT: 0in; PADDING-TOP: 0in" valign="bottom" width="1%">  </td></tr></table>   <div style="BORDER-BOTTOM: white 1pt solid; BORDER-LEFT: white 1pt solid; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: white 1pt solid; BORDER-RIGHT: white 1pt solid; PADDING-TOP: 0in"> <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Other transactions involving certain monetary assets and liabilities denominated in foreign currencies have been converted into U.S. dollars at exchange rates in effect at the balance sheet date, and the related revenues and expenses are converted using either specific or average exchange rates for the period, as appropriate.  Net foreign exchange transaction gains and losses arising from these activities are reported as a component of net income in the period in which they arise. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Investments and Cash <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Montpeliers fixed maturity investments and equity securities are carried at fair value, with the net unrealized appreciation or depreciation on such securities included in income and reported within net realized and unrealized gains (losses) in the Companys statement of operations. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Montpeliers other investments are carried at either fair value or on the equity method of accounting (which is based on underlying net asset values) and consist primarily of investments in limited partnership interests and private investment funds, event-linked securities whose principal and interest are forgiven if specific events occur (CAT Bonds), private placements and certain derivative instruments.  See Notes 4 and 6. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Investments are recorded on a trade date basis. The fair value of the investment portfolio is determined based on bid prices (as opposed to ask prices), which are not adjusted for transaction costs. Gains and losses on sales of investments are determined on the first-in, first-out basis and are included in income when realized. Realized gains and losses typically result from the actual sale of securities. Unrealized gains and losses represent the gain or loss that would result from a hypothetical sale of securities on the reporting date. In instances where the Company becomes aware of a significant unrealized loss with little or no likelihood of recovery, it writes down the cost basis of the investment and recognizes the loss as being realized. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Some of Montpeliers investment managers are entitled to performance fees determined as a percentage of the portfolios net total return achieved over specified periods. Montpeliers net realized and unrealized investment gains and net income (expense) from derivative instruments are presented net of any associated performance fees.  During the first quarters of 2011 and 2010, Montpelier incurred performance fees related to investments and investment-related derivative instruments of $0.3 million and $0.2 million, respectively. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Cash and cash equivalents include cash and fixed income investments with maturities of less than three months, as measured from the date of purchase. Restricted cash of $9.9 million at March 31, 2011 consisted of $6.6 million of collateral supporting open short sale investment and derivative positions and $3.3 million of overseas deposit accounts held at Lloyds.  Restricted cash of $27.1 million at December 31, 2010 consisted of $24.1 million of collateral supporting open short sale investment and derivative positions and $3.0 million of overseas deposit accounts held at Lloyds. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">As of March 31, 2011 and December 31, 2010, $7.1 million and $11.2 million, respectively, of Montpeliers cash and cash equivalents served as collateral for securities sold under repurchase agreements. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Net investment income is stated net of investment management, custody and other investment-related expenses. Investment income includes interest and dividend income together with the amortization of premiums and the accretion of discounts on fixed maturities purchased at amounts different from their par value. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Common Shares Held in Treasury <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">The Companys common shares (Common Shares) held in treasury are carried at cost and any resulting gain or loss on subsequent issuances is determined on a last-in, first-out basis.  As of March 31, 2011 and December 31, 2010, the Company had inception-to-date gains from issuances of its treasury shares of $1.9 million and $2.0 million, respectively, which has been recorded as additional paid-in capital. See Note 8. <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Funds Withheld <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Funds withheld by reinsured companies represent insurance balances retained by ceding companies in accordance with contractual terms. Montpelier typically earns investment income on these balances during the period the funds are held. As of March 31, 2011 and December 31, 2010, funds withheld balances of $4.4 million and $6.0 million, respectively, were recorded within other assets on the Companys consolidated balance sheets.</div>   <div style="BORDER-BOTTOM: white 1pt solid; BORDER-LEFT: white 1pt solid; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: white 1pt solid; BORDER-RIGHT: white 1pt solid; PADDING-TOP: 0in"> <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">Intangible Asset <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">  <p style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; TEXT-INDENT: 9pt; MARGIN: 0in 0in 0pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in">In connection with the acquisition of MUSIC in 2007, Montpelier recorded a $4.7 million intangible asset representing the fair value of MUSICs excess and surplus lines authorizations acquired.  This intangible asset is considered by Montpelier to have an indefinite useful life.  As such, the intangible asset will not be amortized but will be tested no less than annually for impairment.  If the carrying amount of the intangible asset is greater than the fair values established during impairment testing, the carrying value will be immediately written-down to the fair value with a corresponding impairment loss recognized in the Companys consolidated statement of operations. Through March 31, 2011, the Company had not recognized any impairment to this intangible asset.</div></td></tr></table> NOTE 1.  Summary of Significant Accounting Policies   Basis of Presentation   Montpelier Re Holdings Ltd. (the Company or thefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescription containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements. Describes procedure if disclosures are provided in more than one note to the financial statements. Also includes the description of all significant accounting policies of the reporting entity.No authoritative reference available.falsefalseSummary of Significant Accounting Policies12Summary of Significant Accounting PoliciesUnKnownUnKnownUnKnownUnKnownfalsetrue