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Interim financial statements (Details) - USD ($)	Oct. 07, 2025	Oct. 06, 2025	Sep. 30, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Investments restricted for statutory reserve funds			$ 526,400,000	$ 535,500,000
Restricted cash and cash equivalent			$ 7,800,000	$ 9,500,000
New Credit Agreement | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000,000.0
New Credit Agreement | Line of Credit | Subsequent Event | Revolving Credit Facility
Debt Instrument [Line Items]
Increase limit	$ 125,000,000.0
Senior Unsecured Credit Agreement, Maturing 2026 | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 200,000,000.0

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