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Income taxes (Tables)
6 Months Ended
Jun. 30, 2023
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Continuing operations    
Provision (benefit) for income taxes (in millions)$23.4 29.3 $43.7 (11.8)
Effective tax rate39.9 %43.4 %45.3 %(11.7 %)