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Restructuring Expenses (Details)
$ in Millions
 12 Months Ended 36 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
employees
Restructuring Cost and Reserve [Line Items]        
Headcount reduction | employees       2,750
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning of period $ 16.9 $ 25.4 $ 0.0 $ 0.0
Provision 12.0 23.0 46.4  
Provision reversal (0.1) (0.7)    
Less: Non-cash expense     (2.0)  
Less: Cash expense     44.4  
Cash activity (13.3) (29.5) (18.8)  
Foreign currency translation (0.2) (1.3) (0.2)  
Restructuring reserve, end of period 15.3 16.9 25.4 15.3
Write-down of Property, Plant and Equipment        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning of period 0.0 0.0 0.0 0.0
Provision 0.0 0.0 1.2  
Provision reversal 0.0 0.0    
Less: Non-cash expense     (1.2)  
Less: Cash expense     0.0  
Cash activity 0.0 0.0 0.0  
Foreign currency translation 0.0 0.0 0.0  
Restructuring reserve, end of period 0.0 0.0 0.0 0.0
Employee Severance        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning of period 16.9 25.3 0.0 0.0
Provision 11.0 23.0 45.1  
Provision reversal (0.1) (0.7)    
Less: Non-cash expense     (0.8)  
Less: Cash expense     44.3  
Cash activity (13.1) (29.4) (18.8)  
Foreign currency translation (0.2) (1.3) (0.2)  
Restructuring reserve, end of period 14.5 16.9 25.3 14.5
Facility Closure Costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning of period 0.0 0.1 0.0 0.0
Provision 1.0 0.0 0.1  
Provision reversal 0.0 0.0    
Less: Non-cash expense     0.0  
Less: Cash expense     0.1  
Cash activity (0.2) (0.1) 0.0  
Foreign currency translation 0.0 0.0 0.0  
Restructuring reserve, end of period $ 0.8 $ 0.0 $ 0.1 $ 0.8