General	6 Months Ended
Jun. 30, 2015
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. References to $ are to the lawful currency of the United States and to CHF are to the lawful currency of Switzerland. During the fourth quarter of 2014, the Company reorganized how it manages its business, and as a result it realigned its executive management team and changed its reportable segments to correspond to the reorganization. The Company's Bermuda insurance operations, except for the trade credit line of business, which had previously been included in the international insurance segment, was combined with the U.S. insurance segment, with the new segment renamed the "North American Insurance" segment. The remaining direct insurance operations of the international insurance segment were renamed the "Global Markets Insurance" segment. The Reinsurance segment remained unchanged. The newly created segments are included in Note 12 and prior periods have been recast to conform to the new presentation.

General

6 Months Ended

Jun. 30, 2015

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. References to $ are to the lawful currency of the United States and to CHF are to the lawful currency of Switzerland.

During the fourth quarter of 2014, the Company reorganized how it manages its business, and as a result it realigned its executive management team and changed its reportable segments to correspond to the reorganization. The Company's Bermuda insurance operations, except for the trade credit line of business, which had previously been included in the international insurance segment, was combined with the U.S. insurance segment, with the new segment renamed the "North American Insurance" segment. The remaining direct insurance operations of the international insurance segment were renamed the "Global Markets Insurance" segment. The Reinsurance segment remained unchanged. The newly created segments are included in Note 12 and prior periods have been recast to conform to the new presentation.