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Income taxes - Income Tax Expense (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Tax Disclosure [Abstract]            
Income tax (benefit) expense   $ 1,333,000   $ (3,998,000) $ 299,542,000 $ (12,251,000)
Current Foreign Tax Expense (Benefit)   1,500,000   4,600,000 2,900,000 13,400,000
Other Tax Expense (Benefit)   300,000   100,000 400,000 200,000
Income Tax Effects Allocated Directly to Equity, Other   500,000   $ 300,000 3,000,000.0 $ 600,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions $ 3,900,000          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 200,000 $ 294,900,000   $ 295,100,000  
Minimum Effective Tax 1500.00% 1500.00%     1500.00%