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Income taxes (Tables)
3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)

Three Months Ended March 31,
 
2020
 
2019
Continuing operations
 
 
 
Provision (benefit) for income taxes (in millions)
$
(12.2
)
 
9.7

Effective tax rate
129.8
%
 
40.1
%