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Income taxes (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]          
Valuation allowance $ 78.0   $ 78.0   $ 78.0
Unrecognized tax benefits 10.9   10.9   10.2
Gross increase in unrecognized tax benefits, current period 0.3   0.6    
Reasonable possibility of future tax benefits 1.8   1.8    
Accrued interest related to uncertain tax positions $ 1.1   $ 1.1    
Effective income tax rate 11.00% 14.00% 14.00% 18.00%  
U.S. federal statutory rate 21.00% 35.00% 21.00% 35.00%  
Hungary statutory tax rate     9.00%    
Tax Act, provisional income tax expense (benefit)         $ 69.9
Hungary          
Operating Loss Carryforwards [Line Items]          
Foreign income tax benefit $ 2.9 $ 4.4 $ 4.6 $ 7.3  
Malaysia          
Operating Loss Carryforwards [Line Items]          
Income tax benefit of tax holiday, amount $ 0.5 $ 0.6 $ 1.1 $ 1.1  
Income tax benefit of tax holiday (in usd per share) $ 0.01 $ 0.01 $ 0.01 $ 0.01