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Income taxes (Tables)
9 Months Ended
Sep. 30, 2020
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Continuing operations    
Provision for income taxes (in millions)$58.9 14.7 $3.5 37.1 
Effective tax rate161.4 %67.4 %(3,500.0 %)51.0 %