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Significant transactions - Mount Beacon, OneBeacon, Ashmere and Symetra (Details) - USD ($)
$ / shares in Units, $ in Millions
May 17, 2016
Apr. 18, 2016
Feb. 01, 2016
OneBeacon      
Other significant transactions      
Proceeds from sale of investments   $ 178.3  
Amount of excess of fair value over the equity method carrying value accounted as additional paid-in surplus   22.1  
Symetra      
Other significant transactions      
Proceeds from sale of investments     $ 559.8
Sale price of equity investment (in dollars per share)     $ 32.00
Sirius Global Solutions | Ashmere Insurance Company      
Other significant transactions      
Proceeds from sale of investments   $ 18.5  
Sirius Global Solutions | FSA      
Other significant transactions      
Consideration $ 15.8    
Percentage of ownership interest acquired 100.00%