General	12 Months Ended
Dec. 31, 2013
General [Abstract]
General	GENERAL Allied World Assurance Company Holdings, AG, a Swiss holding company (“Allied World Switzerland”), through its wholly-owned subsidiaries (collectively, the “Company”), provides property and casualty insurance and reinsurance on a worldwide basis through operations in Bermuda, the United States, Canada, Europe, Hong Kong, Labuan and Singapore. References to $ are to the lawful currency of the United States and to CHF are to the lawful currency of Switzerland. In December 2010, Allied World Switzerland and Allied World World Assurance Company Holdings, Ltd ("Allied World Bermuda") entered into a contribution-in-kind agreement to effect the redomestication to Switzerland from Bermuda. Under the terms of the contribution-in-kind agreement all issued and outstanding voting and non-voting shares of Allied World Bermuda were cancelled and issued to Allied World Switzerland as a contribution-in-kind in exchange for which the holders of such voting and non-voting shares immediately prior to the completion of the redomestication received the same number of voting and non-voting shares of Allied World Switzerland.

GENERAL

Allied World Assurance Company Holdings, AG, a Swiss holding company (“Allied World Switzerland”), through its wholly-owned subsidiaries (collectively, the “Company”), provides property and casualty insurance and reinsurance on a worldwide basis through operations in Bermuda, the United States, Canada, Europe, Hong Kong, Labuan and Singapore. References to $ are to the lawful currency of the United States and to CHF are to the lawful currency of Switzerland.

In December 2010, Allied World Switzerland and Allied World World Assurance Company Holdings, Ltd ("Allied World Bermuda") entered into a contribution-in-kind agreement to effect the redomestication to Switzerland from Bermuda. Under the terms of the contribution-in-kind agreement all issued and outstanding voting and non-voting shares of Allied World Bermuda were cancelled and issued to Allied World Switzerland as a contribution-in-kind in exchange for which the holders of such voting and non-voting shares immediately prior to the completion of the redomestication received the same number of voting and non-voting shares of Allied World Switzerland.