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Fair value measurements - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets $ 50,220 $ 48,758
Long-term debt at fair value 3,469,300 3,793,500
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 12,648,900 12,878,000
Goodwill at fair value 9,016,500 9,022,100
Net intangible assets at fair value $ 3,632,400 $ 3,855,900