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Income taxes, Unrecognized tax benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Uncertainties [Abstract]      
Unrecognized tax benefits, current $ 0.4 $ 0.8  
Unrecognized tax benefits, noncurrent 8.4 1.2  
Gross unrecognized tax benefits activity [Roll Forward]      
Gross unrecognized tax benefits, beginning balance 2.0 1.8 $ 1.5
Increases for tax positions for prior years 0.0 0.0 0.0
Unrecognized tax benefits acquired in business combinations 6.5    
Decreases for tax positions for prior years 0.0 0.0 0.0
Increases for tax positions for current year 0.3 0.5 0.3
Settlements 0.0 (0.3) 0.0
Lapse of statute of limitations 0.0 0.0 0.0
Gross unrecognized tax benefits, ending balance $ 8.8 $ 2.0 $ 1.8
U.S. Federal Tax Authority [Member]      
Gross unrecognized tax benefits activity [Roll Forward]      
Open tax year 2013 2014 2015 2016 2017    
Federal income tax year selected for audit 2013 2014    
United Kingdom Tax Authority [Member]      
Gross unrecognized tax benefits activity [Roll Forward]      
Open tax year 2010 2011 2012 2013 2014 2015 2016 2017    
Canada Revenue Agency [Member]      
Gross unrecognized tax benefits activity [Roll Forward]      
Open tax year 2011 2012 2013 2014 2015 2016 2017