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v3.25.3

Interim financial statements (Details) - USD ($) | Oct. 07, 2025 | Oct. 06, 2025 | Sep. 30, 2025 | Dec. 31, 2024
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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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