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Basis of presentation - Schedule of Impact of Restatement on Certain Line Items and Balance Sheet (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Income (Loss) from equity method investments $ 2.0 $ 1.0 $ (2.0) $ 1.0
Maximum [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Income (Loss) from equity method investments   $ 0.5