Subsequent Event

9 Months Ended

Sep. 30, 2012

Subsequent Events [Abstract]

Subsequent Events

Note 16. Subsequent Event

On October 16, 2012, OneBeacon announced it entered into an agreement to terminate its exclusive underwriting agreement with Hagerty Insurance Agency and to sell one of its insurance entities to Markel Corporation. OneBeacon anticipates recording an after-tax gain of $15 million related to this transaction. The sale is subject to regulatory approvals and is expected to close during the first quarter of 2013. The business associated with this agreement generated written premiums of approximately $179 million, or 16% of OneBeacon's consolidated written premiums for the twelve months prior to September 30, 2012.