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Restructuring Expenses (Details)
$ in Millions
 3 Months Ended 48 Months Ended
Mar. 31, 2018
USD ($)
employees
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
employees
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, headcount reduction (approximately) | employees 110   3,370
Restructuring Reserve [Roll Forward]      
Restructuring expenses $ 5.9 $ 5.1  
Employee Severance [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning of period 10.9    
Restructuring expenses 5.9    
Restructuring cash activity (3.7)    
Foreign currency translation 0.1    
Restructuring reserve, end of period $ 13.2   $ 10.9