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Long-term debt - Narrative (Details)
 9 Months Ended
Sep. 22, 2025
USD ($)
Jul. 02, 2025
USD ($)
Sep. 30, 2025
USD ($)
Covenant
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]        
Unsecured notes     $ 2,540,000,000 $ 3,090,000,000
Cash and cash equivalents     $ 232,775,000 $ 693,214,000
Number of covenants | Covenant     1  
Amended and Restated Competitive Advance and Revolving Credit Agreement | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Unused borrowing capacity     $ 738,200,000  
Maximum borrowing capacity under credit facility     $ 750,000,000  
Line of credit facility, expiration date     Jan. 31, 2029  
Amended and Restated Competitive Advance and Revolving Credit Agreement | Line of Credit | Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding     $ 11,800,000  
Unsecured notes bearing fixed rate interest at 4.75% due March 2026        
Debt Instrument [Line Items]        
Repayments of unsecured notes $ 300,000,000 $ 250,000,000    
Unsecured notes 550,000,000 550,000,000 $ 550,000,000  
Payment of accrued interest 300,000 3,500,000    
Unamortized debt issuance costs $ 400,000 $ 500,000