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Restructuring Expenses (Details)
$ in Millions
 3 Months Ended 6 Months Ended 48 Months Ended
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
employees
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
employees
Restructuring Cost and Reserve [Line Items]            
Restructuring and related cost, headcount reduction (approximately) | employees       340   3,370
Restructuring Reserve [Roll Forward]            
Restructuring reserve, beginning of period $ 13.2 $ 10.9   $ 10.9    
Restructuring expenses 2.7 5.9 $ 0.4 8.6 $ 5.5  
Cash expense 2.4          
Less: Non-cash activity (0.3)          
Restructuring cash activity (4.7) (3.7)        
Foreign currency translation (0.8) 0.1        
Restructuring reserve, end of period 10.1 13.2   10.1   $ 10.9
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 0.3 0.0        
Cash expense 0.0          
Less: Non-cash activity (0.3)          
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 13.2 10.9   10.9    
Restructuring expenses 2.4 5.9        
Cash expense 2.4          
Less: Non-cash activity 0.0          
Restructuring cash activity (4.7) (3.7)        
Foreign currency translation (0.8) 0.1        
Restructuring reserve, end of period $ 10.1 $ 13.2   $ 10.1   $ 10.9