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Income taxes (Tables)
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Continuing operations    
Provision for income taxes (in millions)$22.9 58.9 $59.2 3.5 
Effective tax rate49.9 %161.4 %47.5 %(3,500.0 %)