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Restructuring Expenses (Details)
$ in Millions
 12 Months Ended 36 Months Ended
Dec. 31, 2017
USD ($)
employees
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
employees
Restructuring Cost and Reserve [Line Items]        
Restructuring and Related Cost, Number of Positions Eliminated | employees 620     2,750
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning of period $ 15.3 $ 16.9 $ 25.4  
Provision 12.6 12.0 23.0  
Restructuring Non-cash expense (0.2)      
Cash expense 12.4      
Provision reversal (1.4) (0.1) (0.7)  
Cash activity (16.8) (13.3) (29.5)  
Foreign currency translation 1.4 (0.2) (1.3)  
Restructuring reserve, end of period 10.9 15.3 16.9 $ 15.3
Write-down of Property, Plant and Equipment        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning of period 0.0 0.0 0.0  
Provision 0.2 0.0 0.0  
Restructuring Non-cash expense (0.2)      
Cash expense 0.0      
Provision reversal 0.0 0.0 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 14.5 16.9 25.3  
Provision 12.4 11.0 23.0  
Restructuring Non-cash expense 0.0      
Cash expense 12.4      
Provision reversal (1.4) (0.1) (0.7)  
Cash activity (16.0) (13.1) (29.4)  
Foreign currency translation 1.4 (0.2) (1.3)  
Restructuring reserve, end of period 10.9 14.5 16.9 14.5
Facility Closure Costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning of period 0.8 0.0 0.1  
Provision 0.0 1.0 0.0  
Restructuring Non-cash expense 0.0      
Cash expense 0.0      
Provision reversal 0.0 0.0 0.0  
Cash activity (0.8) (0.2) (0.1)  
Foreign currency translation 0.0 0.0 0.0  
Restructuring reserve, end of period $ 0.0 $ 0.8 $ 0.0 $ 0.8