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Noncontrolling interests - Narrative (Details) $ / shares in Units, $ in Millions	4 Months Ended
	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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- Definition

Business Acquisition, Number of Common Shares Acquired

+ References

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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

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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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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

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- Definition

Amount of maximum exposure to loss from involvement with consolidated variable interest entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

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