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Segment reporting - Concentration Risk (Details) - Gross Premiums Written	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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 | Largest contract
Revenue, Major Customer [Line Items]
Concentration risk, percentage		14.40%	15.50%
Contract Concentration Risk | Second largest contract
Revenue, Major Customer [Line Items]
Concentration risk, percentage			10.70%
Contract Concentration Risk | Total for contracts contributing greater than 10% each
Revenue, Major Customer [Line Items]
Concentration risk, percentage	0.00%	14.40%	26.20%
Contract Concentration Risk | Total for contracts contributing less than 10% each
Revenue, Major Customer [Line Items]
Concentration risk, percentage	100.00%	85.60%	73.80%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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