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Income taxes (Tables)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)

Three Months Ended March 31,
 
2019
 
2018
Continuing operations
 
 
 
Provision for income taxes (in millions)
$
9.7

 
11.4

Effective tax rate
40.1
%
 
31.1
%