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v3.19.3.a.u2

Segment reporting - Concentration Risk (Details) - Gross Premiums Written | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00%
Contract Concentration Risk |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00%
Contract Concentration Risk | Contract 1 |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 15.20% | 17.50% | 16.10%
Contract Concentration Risk | Contract 2 |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage |  | 12.10% | 14.10%
Contract Concentration Risk | Contract 3 |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage |  |  | 13.10%
Contract Concentration Risk | Total for contracts contributing greater than 10% each |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 15.20% | 29.60% | 43.30%
Contract Concentration Risk | Total for contracts contributing less than 10% each |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 84.80% | 70.40% | 56.70%

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