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Loss and loss adjustment expense reserves - Schedule of payout percentage on losses (Details)
Dec. 31, 2019
Other Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 1.20%
Year 2 0.00%
Year 3 0.00%
Year 4 0.00%
Year 5 0.00%
Year 6 0.00%
Year 7 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Other Property  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 48.60%
Year 2 28.40%
Year 3 8.80%
Year 4 5.40%
Year 5 2.60%
Year 6 1.30%
Year 7 0.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Workers’ Compensation  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 9.30%
Year 2 21.80%
Year 3 22.50%
Year 4 16.20%
Year 5 10.80%
Year 6 2.90%
Year 7 4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.00%
Auto  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 45.40%
Year 2 43.60%
Year 3 7.00%
Year 4 1.80%
Year 5 0.50%
Year 6 0.00%
Year 7 0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Other Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 1.50%
Year 2 7.40%
Year 3 13.40%
Year 4 14.80%
Year 5 13.60%
Year 6 9.90%
Year 7 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Credit & Financial Lines  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 9.30%
Year 2 23.60%
Year 3 28.50%
Year 4 12.70%
Year 5 3.60%
Year 6 0.10%
Year 7 (0.30%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Multi-line  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 21.10%
Year 2 27.30%
Year 3 21.80%
Year 4 (0.10%)
Year 5 2.10%
Year 6 0.40%
Year 7 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Other Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 6.20%
Year 2 42.10%
Year 3 3.70%
Year 4 0.00%
Year 5 0.00%
Year 6 0.00%
Year 7 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.00%
Contracts incepting in 2013 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.40%
Year 2 23.90%
Year 3 31.70%
Year 4 4.70%
Year 5 3.50%
Year 6 2.60%
Year 7 3.30%
Contracts incepting in 2014 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%
Year 2 0.00%
Year 3 0.00%
Year 4 0.00%
Year 5 0.00%
Year 6 0.00%
Contracts incepting in 2015 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%
Year 2 0.00%
Year 3 0.00%
Year 4 0.00%
Year 5 0.00%
Contracts incepting in 2017 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%
Year 2 0.00%
Year 3 0.00%
Contracts incepting in 2018 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%
Year 2 97.00%
Contracts incepting in 2019 [Member] | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%