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Components of lease cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of lease expense [Line Items]        
Finance Lease, Right-of-Use Asset, Amortization $ 0.2   $ 0.4  
Finance Lease, Interest Expense 0.0   0.1  
Total finance lease cost 0.2   0.5  
Operating lease cost 6.7   13.4  
Short-term lease cost 1.7   3.4  
Variable lease cost 2.3   4.2  
Total lease cost 10.9   21.5  
Cost of Sales [Member]        
Components of lease expense [Line Items]        
Lease expense 8.2 $ 7.2 16.0 $ 14.3
Selling, General and Administrative Expenses [Member]        
Components of lease expense [Line Items]        
Lease expense $ 2.5 $ 2.4 $ 5.0 $ 5.0