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Adjustments to quarterly financial data - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income tax provision (benefit) $ (2.5) $ 19.9 $ 34.3 $ (13.0)
Tax Adjustments        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income tax provision (benefit)   $ 8.1   $ 1.7