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Summary of Significant Accounting Policies - Restructuring Costs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Restructuring Costs [Abstract]    
Restructuring costs $ 34,500,000  
Restructuring reserve [Roll Forward]    
Balance at beginning of period 4,500,000 $ 16,400,000
Costs paid or utilized (25,500,000) (11,900,000)
Severance Costs 24,700,000  
Office closure costs 9,800,000  
Balance at end of year 13,500,000 4,500,000
Reportable segments | Americas    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 400,000 3,500,000
Costs paid or utilized (5,000,000) (3,100,000)
Severance Costs 5,800,000  
Office closure costs 500,000  
Balance at end of year 1,700,000 400,000
Reportable segments | Americas | United States | Reportable subsegments    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 400,000 2,900,000
Costs paid or utilized (3,100,000) (2,500,000)
Severance Costs 3,700,000  
Office closure costs 500,000  
Balance at end of year 1,500,000 400,000
Reportable segments | Southern Europe    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 1,300,000 1,700,000
Costs paid or utilized (400,000) (400,000)
Severance Costs 0  
Office closure costs 0  
Balance at end of year 900,000 1,300,000
Reportable segments | Southern Europe | France | Reportable subsegments    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 1,300,000 1,500,000
Costs paid or utilized (400,000) (200,000)
Balance at end of year 900,000 1,300,000
Reportable segments | Southern Europe | Italy | Reportable subsegments    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 0 0
Balance at end of year 0 0
Reportable segments | Northern Europe    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 2,600,000 8,500,000
Costs paid or utilized (16,800,000) (5,900,000)
Severance Costs 15,600,000  
Office closure costs 8,200,000  
Balance at end of year 9,600,000 2,600,000
Reportable segments | APME    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 100,000 1,700,000
Costs paid or utilized (1,500,000) (1,600,000)
Severance Costs 900,000  
Office closure costs 500,000  
Balance at end of year 0 100,000
Reportable segments | Right Management    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 100,000 800,000
Costs paid or utilized (900,000) (700,000)
Severance Costs 1,400,000  
Office closure costs 600,000  
Balance at end of year 1,200,000 100,000
Corporate    
Restructuring reserve [Roll Forward]    
Balance at beginning of period 0 200,000
Costs paid or utilized (900,000) (200,000)
Severance Costs 1,000,000  
Office closure costs 0  
Balance at end of year $ 100,000 $ 0