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Pension Plan (Notes) | 9 Months Ended
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Sep. 30, 2015
Compensation Related Costs [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Note 19. OneBeacon Pension Plan OneBeacon sponsors qualified and non-qualified, non-contributory, defined benefit pension plans covering substantially all employees who were employed as of December 31, 2001 and former employees who had met the eligibility requirements, as well as retirees. Current plans include the OneBeacon qualified pension plan (the “Qualified Plan”) and the OneBeacon nonqualified pension plan (the “Non-qualified Plan”) (collectively the “Plans”). OneBeacon's Plans were frozen and curtailed in 2002. The benefits for the Plans are based primarily on years of service and employees’ compensation through December 31, 2002. OneBeacon’s funding policy is consistent with the funding requirements of U.S. federal laws and regulations. In April 2014, OneBeacon voted to terminate the Qualified Plan as of June 30, 2014 and applied for a determination letter from the Internal Revenue Service (“IRS”) with respect to the Qualified Plan's tax qualified status at termination and received a favorable determination letter from the IRS on July 23, 2015. OneBeacon currently anticipates the majority of plan assets to be distributed within 12 months of the receipt of the favorable determination letter by way of annuity contract purchases and/or lump sum payments to Plan participants. The purchase of annuities is also subject to the availability of such contracts, with creditworthy insurance companies, at negotiated market terms deemed acceptable to the Plan Sponsor. OneBeacon reserves the right to revoke the termination and does not expect the impact of the termination to be material on OneBeacon's financial position.

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