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Restructuring Expenses (Details)
$ in Millions
 3 Months Ended 6 Months Ended 36 Months Ended
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
employees
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
employees
Restructuring Cost and Reserve [Line Items]            
Restructuring and related cost, headcount reduction (approximately) | employees       220   2,750
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period $ 14.6 $ 15.3   $ 15.3    
Restructuring expenses 0.4 5.1 $ 2.1 5.5 $ 4.0  
Restructuring non-cash expense   (0.2)        
Restructuring Costs   4.9        
Restructuring cash activity (2.5) (5.8)        
Foreign currency translation 0.9 0.2        
Restructuring reserve, end of period 13.4 14.6   13.4   $ 15.3
Write-down Of Property, Plant And Equipment [Member]            
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period 0.0 0.0   0.0    
Restructuring expenses 0.0 0.2        
Restructuring non-cash expense   (0.2)        
Restructuring Costs   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   0.0   0.0
Employee Severance [Member]            
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period 14.6 14.5   14.5    
Restructuring expenses 0.4 4.9        
Restructuring non-cash expense   0.0        
Restructuring Costs   4.9        
Restructuring cash activity (2.5) (5.0)        
Foreign currency translation 0.9 0.2        
Restructuring reserve, end of period 13.4 14.6   13.4   14.5
Facility Closing Costs [Member]            
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period 0.0 0.8   0.8    
Restructuring expenses 0.0 0.0        
Restructuring non-cash expense   0.0        
Restructuring Costs   0.0        
Restructuring cash activity 0.0 (0.8)        
Foreign currency translation 0.0 0.0        
Restructuring reserve, end of period $ 0.0 $ 0.0   $ 0.0   $ 0.8