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Loss and loss adjustment expense reserves - Schedule of payout percentage on losses (Details)
Dec. 31, 2020
Global A&H  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 23.30%
Year 2 31.60%
Year 3 34.10%
Year 4 30.40%
Year 5 0.00%
Year 6 0.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Marine & Energy  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%
Year 2 0.90%
Year 3 21.60%
Year 4 1.80%
Year 5 0.00%
Year 6 0.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Credit  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 12.70%
Year 2 22.20%
Year 3 26.90%
Year 4 11.60%
Year 5 3.10%
Year 6 (1.10%)
Year 7 (1.40%)
Year 8 (1.50%)
Year 9 0.00%
Casualty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 19.20%
Year 2 24.20%
Year 3 11.80%
Year 4 7.80%
Year 5 4.90%
Year 6 2.10%
Year 7 1.90%
Year 8 1.10%
Year 9 2.00%
Other Specialty  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 25.30%
Year 2 34.80%
Year 3 22.90%
Year 4 0.30%
Year 5 3.00%
Year 6 0.70%
Year 7 0.10%
Year 8 0.00%
Year 9 0.00%
Property Catastrophe Excess Reinsurance  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 6.80%
Year 2 37.80%
Year 3 0.00%
Year 4 0.00%
Year 5 0.00%
Year 6 0.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Property Risk and Pro Rata  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 47.60%
Year 2 29.50%
Year 3 10.20%
Year 4 5.30%
Year 5 3.10%
Year 6 1.40%
Year 7 1.00%
Year 8 0.30%
Year 9 0.00%
Agriculture  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 2.70%
Year 2 93.80%
Year 3 3.50%
Year 4 0.00%
Year 5 0.00%
Year 6 0.00%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Other  
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%
Year 7 0.00%
Year 8 0.00%
Year 9 0.00%
Contracts incepting in 2013 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 4.40%
Year 2 23.70%
Year 3 31.40%
Year 4 4.60%
Year 5 3.40%
Year 6 2.60%
Year 7 3.30%
Year 8 0.00%
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%
Year 7 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%
Year 6 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%
Year 4 0.00%
Contracts incepting in 2018 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%
Year 2 97.10%
Year 3 0.00%
Contracts incepting in 2019 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%
Year 2 0.00%
Contracts incepting in 2020 | Retroactive reinsurance contracts  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Year 1 0.00%