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Debt and letter of credit facilities - Narrative (Details) - USD ($)
3 Months Ended
Feb. 26, 2021
Mar. 31, 2025
Mar. 31, 2024
Debt Instrument [Line Items]      
Interest expense   $ 11,800,000 $ 11,800,000
Funds withheld   8,400,000 $ 7,100,000
Revolving Credit Facility      
Debt Instrument [Line Items]      
Contractual term 4 years    
Maximum borrowing capacity $ 400,000,000    
Outstanding borrowings   $ 0