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Leasing Components of lease cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Components of lease expense [Line Items]    
Finance Lease, Right-of-Use Asset, Amortization $ 0.2  
Finance Lease, Interest Expense 0.1  
Total finance lease cost 0.3  
Operating Lease, Cost 6.7  
Short-term Lease, Cost 1.7  
Variable Lease, Cost 1.9  
Total lease cost 10.6  
Cost of Sales [Member]    
Components of lease expense [Line Items]    
Lease expense 7.8 $ 7.1
Selling, General and Administrative Expenses [Member]    
Components of lease expense [Line Items]    
Lease expense $ 2.5 $ 2.6