Long-term debt - Narrative (Details)		3 Months Ended
	Jan. 25, 2024 USD ($)	Mar. 31, 2024 USD ($) Covenant	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Cash and cash equivalents		$ 430,764,000	$ 361,036,000
Number of covenants | Covenant		1
Line of Credit | Bridge Loan
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	$ 50,000,000
Amended and Restated Competitive Advance and Revolving Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Unused borrowing capacity		$ 737,300,000
Maximum borrowing capacity under credit facility	$ 750,000,000	$ 750,000,000	$ 1,510,000,000
Debt instrument, term	5 years
Leverage ratio, step-up	0.5
Restricted cash amount requirement	$ 600,000,000
Debt instrument covenant consolidated leverage ratio	4.5
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]
Current borrowing capacity under credit facility		$ 12,700,000
Springing maturity, term	91 days
Springing maturity threshold	$ 300,000,000