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Subsequent Events (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 21, 2017
Jan. 31, 2017
Jun. 30, 2017
Jan. 01, 2017
Dec. 31, 2016
Jan. 01, 2016
DaVinciRe Holdings Ltd.              
Subsequent Event [Line Items]              
Noncontrolling interest, Change from purchase or sale of interests     $ 24.0        
Parent company ownership in redeemable noncontrolling interest       22.60% 22.60% 24.00% 24.00%
Common Shares              
Subsequent Event [Line Items]              
Common shares repurchased during period, Number of shares       1,100      
Common shares repurchased during period, Aggregate amount       $ 149.7      
Common shares repurchased during period, Average cost (in dollars per share)       $ 142.33      
Subsequent Event | DaVinciRe Holdings Ltd.              
Subsequent Event [Line Items]              
Noncontrolling interest, Change from purchase or sale of interests $ 12.0            
Parent company ownership in redeemable noncontrolling interest 23.50%            
Subsequent Event | Common Shares              
Subsequent Event [Line Items]              
Common shares repurchased during period, Number of shares   15          
Common shares repurchased during period, Aggregate amount   $ 2.1          
Common shares repurchased during period, Average cost (in dollars per share)   $ 139.93