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Losses and Loss Expenses - Information about average percentage payout (Details)
Dec. 31, 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 18.00%
Year Two 23.00%
Year Three 15.00%
Year Four 11.00%
Year Five 8.00%
Year Six 5.00%
Year Seven 4.00%
Year Eight 2.00%
Year Nine 2.00%
Year Ten 3.00%
Insurance Segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 17.00%
Year Two 22.00%
Year Three 16.00%
Year Four 11.00%
Year Five 9.00%
Year Six 6.00%
Year Seven 4.00%
Year Eight 2.00%
Year Nine 2.00%
Year Ten 3.00%
Insurance Segment | Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 27.00%
Year Two 38.00%
Year Three 19.00%
Year Four 7.00%
Year Five 4.00%
Year Six 0.00%
Year Seven 1.00%
Year Eight (1.00%)
Year Nine 2.00%
Year Ten 0.00%
Insurance Segment | Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 36.00%
Year Two 31.00%
Year Three 14.00%
Year Four 7.00%
Year Five 4.00%
Year Six 3.00%
Year Seven 1.00%
Year Eight 1.00%
Year Nine 1.00%
Year Ten 0.00%
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 3.00%
Year Nine 3.00%
Year Ten 4.00%
Insurance Segment | Casualty and other  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 8.00%
Year Two 14.00%
Year Three 17.00%
Year Four 14.00%
Year Five 11.00%
Year Six 9.00%
Year Seven 6.00%
Year Eight 4.00%
Year Nine 0.00%
Year Ten 6.00%
Reinsurance Segment  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 20.00%
Year Two 25.00%
Year Three 14.00%
Year Four 8.00%
Year Five 5.00%
Year Six 4.00%
Year Seven 4.00%
Year Eight 0.00%
Year Nine 1.00%
Year Ten 4.00%
Reinsurance Segment | Property and other short-tail lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 29.00%
Year Two 35.00%
Year Three 17.00%
Year Four 7.00%
Year Five 3.00%
Year Six 2.00%
Year Seven 3.00%
Year Eight 1.00%
Year Nine 1.00%
Year Ten 0.00%
Reinsurance Segment | Casualty and Other Long-Tail Lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year One 7.00%
Year Two 9.00%
Year Three 10.00%
Year Four 9.00%
Year Five 8.00%
Year Six 7.00%
Year Seven 6.00%
Year Eight 5.00%
Year Nine 6.00%
Year Ten 6.00%