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Allowance for expected credit losses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for expected credit losses	$ 28.8	$ 28.8
Assets within scope of credit losses | Credit concentration risk | AM Best or S&P
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	60.00%
Assets within scope of credit losses | Credit concentration risk | AM Best or S&P | AM Best or S&P, rated A- or better
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	82.00%

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- Definition

Assets Within Scope Of Credit Losses, Allowance For Credit Loss

+ References

No definition available.

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Name Accounting Standards Codification
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- 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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