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Restructuring Costs (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost [Abstract]    
Net restructuring costs $ 39.3 $ 34.5
Restructuring reserve [Roll Forward]    
Balance, beginning of period 13.5  
Severance Costs 31.8  
Office closure costs and other 7.5  
Costs paid or utilized (20.3)  
Balance, end of period 32.5  
Reportable segments | Americas    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 1.7  
Severance Costs 0.3  
Office closure costs and other 0.0  
Costs paid or utilized (1.6)  
Balance, end of period 0.4  
Reportable segments | Americas | United States | Reportable subsegments    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 1.5  
Balance, end of period 0.4  
Reportable segments | Southern Europe    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 0.9  
Severance Costs 5.4  
Office closure costs and other 0.0  
Costs paid or utilized (2.3)  
Balance, end of period 4.0  
Reportable segments | Southern Europe | France | Reportable subsegments    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 0.9  
Balance, end of period 0.9  
Reportable segments | Southern Europe | Italy | Reportable subsegments    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 0.0  
Balance, end of period 1.4  
Reportable segments | Northern Europe    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 9.6  
Severance Costs 25.8  
Office closure costs and other 7.5  
Costs paid or utilized (15.6)  
Balance, end of period 27.3  
Reportable segments | APME    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 0.0  
Severance Costs 0.0  
Office closure costs and other 0.0  
Costs paid or utilized 0.0  
Balance, end of period 0.0  
Reportable segments | Right Management    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 1.2  
Severance Costs 0.3  
Office closure costs and other 0.0  
Costs paid or utilized (0.7)  
Balance, end of period 0.8  
Corporate    
Restructuring reserve [Roll Forward]    
Balance, beginning of period 0.1  
Severance Costs 0.0  
Office closure costs and other 0.0  
Costs paid or utilized (0.1)  
Balance, end of period $ 0.0