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Noncontrolling interests - Narrative (Details) $ / shares in Units, $ in Millions | 4 Months Ended
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Dec. 31, 2020 USD ($) $ / shares shares
Arcadian Risk Capital Ltd [Member] |
Variable Interest Entity [Line Items] |
Number of Common Shares Acquired | shares | 980,000
Business Acquisition, Share Price | $ / shares | $ 1.00
Variable Interest Entity, Primary Beneficiary [Member] |
Variable Interest Entity [Line Items] |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 49.00%
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount | $ | $ 18.0

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- Details
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