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Reserve for losses and loss expenses (Historical loss duration) (Details)
Dec. 31, 2016
Validus Re | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.00%
Year 2 34.90%
Year 3 20.90%
Year 4 9.10%
Year 5 3.10%
Validus Re | Marine  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 12.00%
Year 2 22.50%
Year 3 19.30%
Year 4 8.90%
Year 5 4.00%
Validus Re | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 51.40%
Year 2 34.40%
Year 3 5.70%
Year 4 1.70%
Year 5 0.80%
Talbot | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 18.20%
Year 2 43.40%
Year 3 21.50%
Year 4 5.80%
Year 5 4.30%
Talbot | Marine  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.00%
Year 2 31.80%
Year 3 16.80%
Year 4 8.60%
Year 5 2.20%
Talbot | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 24.10%
Year 2 30.60%
Year 3 15.60%
Year 4 5.20%
Year 5 15.30%
Western World Insurance Group, Inc | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 73.10%
Year 2 22.40%
Year 3 2.00%
Year 4 0.50%
Year 5 0.10%
Year 6 0.10%
Year 7 0.90%
Year 8 0.00%
Year 9 0.00%
Year 10 0.00%
Western World Insurance Group, Inc | Liability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 8.10%
Year 2 18.90%
Year 3 22.90%
Year 4 20.10%
Year 5 12.00%
Year 6 7.20%
Year 7 3.70%
Year 8 1.80%
Year 9 1.50%
Year 10 0.10%