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Restructuring Expenses (Details)
$ in Millions
 3 Months Ended 6 Months Ended 60 Months Ended
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
employees
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
employees
Restructuring Cost and Reserve [Line Items]            
Restructuring and related cost, headcount reduction (approximately) | employees       40   3,890
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period $ 5.8 $ 7.1   $ 7.1    
Restructuring provision 0.0 (1.7) $ (2.7) (1.7) $ (8.6)  
Less: Non-cash activity   (0.3)        
Cash expense   1.4        
Restructuring cash activity (0.8) (2.6)        
Foreign currency translation 0.0 0.1        
Restructuring reserve, end of period 5.0 5.8   5.0   $ 7.1
Write-down of Property, Plant and Equipment            
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period 0.0 0.0   0.0    
Restructuring provision 0.0 (0.3)        
Less: Non-cash activity   (0.3)        
Cash expense   0.0        
Restructuring cash activity 0.0 0.0        
Foreign currency translation 0.0 0.0        
Restructuring reserve, end of period   0.0       0.0
Employee Severance            
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period 5.8 7.1   7.1    
Restructuring provision 0.0 (1.4)        
Less: Non-cash activity   0.0        
Cash expense   1.4        
Restructuring cash activity (0.8) (2.6)        
Foreign currency translation 0.0 (0.1)        
Restructuring reserve, end of period $ 5.0 $ 5.8   $ 5.0   $ 7.1