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Losses and Loss Expenses - Information about average percentage payout (Details)
Dec. 31, 2016
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 17.00%
Year Two 22.00%
Year Three 15.00%
Year Four 10.00%
Year Five 9.00%
Year Six 6.00%
Year Seven 3.00%
Year Eight 3.00%
Year Nine 3.00%
Year Ten 1.00%
Insurance Segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 16.00%
Year Two 21.00%
Year Three 16.00%
Year Four 11.00%
Year Five 10.00%
Year Six 6.00%
Year Seven 4.00%
Year Eight 3.00%
Year Nine 3.00%
Year Ten 1.00%
Insurance Segment | Professional lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 3.00%
Year Two 13.00%
Year Three 16.00%
Year Four 16.00%
Year Five 15.00%
Year Six 9.00%
Year Seven 6.00%
Year Eight 4.00%
Year Nine 4.00%
Year Ten 1.00%
Insurance Segment | Casualty and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 7.00%
Year Two 14.00%
Year Three 16.00%
Year Four 13.00%
Year Five 13.00%
Year Six 8.00%
Year Seven 5.00%
Year Eight 4.00%
Year Nine 3.00%
Year Ten 3.00%
Insurance Segment | EPC  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 26.00%
Year Two 38.00%
Year Three 20.00%
Year Four 6.00%
Year Five 5.00%
Year Six 1.00%
Year Seven 1.00%
Year Eight 0.00%
Year Nine 1.00%
Year Ten 1.00%
Insurance Segment | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 35.00%
Year Two 30.00%
Year Three 14.00%
Year Four 7.00%
Year Five 4.00%
Year Six 3.00%
Year Seven 2.00%
Year Eight 1.00%
Year Nine 1.00%
Year Ten 1.00%
Reinsurance Segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 20.00%
Year Two 24.00%
Year Three 15.00%
Year Four 8.00%
Year Five 5.00%
Year Six 4.00%
Year Seven 1.00%
Year Eight 2.00%
Year Nine 3.00%
Year Ten 1.00%
Reinsurance Segment | Property and other short-tail lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 29.00%
Year Two 34.00%
Year Three 17.00%
Year Four 7.00%
Year Five 3.00%
Year Six 4.00%
Year Seven 2.00%
Year Eight 1.00%
Year Nine (1.00%)
Year Ten 1.00%
Reinsurance Segment | Casualty and Other Long-Tail Lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 5.00%
Year Two 9.00%
Year Three 10.00%
Year Four 10.00%
Year Five 9.00%
Year Six 7.00%
Year Seven 7.00%
Year Eight 6.00%
Year Nine 6.00%
Year Ten 4.00%