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Schedule IV - Supplementary Reinsurance Information
 12 Months Ended
Dec. 31, 2016
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
Schedule IV - Supplementary reinsurance information
Schedule IV
ALLIED WORLD ASSURANCE COMPANY HOLDINGS, AG
SUPPLEMENTARY REINSURANCE INFORMATION
(Expressed in thousands of United States dollars)
Property and Casualty:
(a)
Gross

(b)
Ceded to
Other
Companies

(c)
Assumed from
Other
Companies

(d)
Net
Amount
(a) - (b) +
(c)

Percentage of
Amount Assumed
to Net
(c) / (d)
Year Ended December 31, 2016
$
2,359.6

 
$
810.0

 
$
706.2


$
2,255.8


31%
Year Ended December 31, 2015
$
2,291.6

 
$
645.0

 
$
801.4


$
2,448.0


33%
Year Ended December 31, 2014
$
1,996.8

 
$
613.4

 
$
938.6


$
2,322.0


40%