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Income taxes - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Uncertain tax positions	$ 1.6	$ 1.5
Operating loss carryforwards	$ 48.5
Bermuda
Operating Loss Carryforwards [Line Items]
Effective tax rate	0.00%
United States
Operating Loss Carryforwards [Line Items]
Effective tax rate	21.00%
United Kingdom
Operating Loss Carryforwards [Line Items]
Effective tax rate	19.00%

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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Amount recognized for uncertainty in income taxes classified as current.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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