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Fair value measurements - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets $ 56,855 $ 34,356
Long-term debt at fair value 4,032,000  
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 $ 0
Level 3 | Fair value, nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 12,917,600  
Goodwill at fair value 8,982,900  
Net intangible assets at fair value $ 3,934,700