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Revenue - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Dec. 30, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Line Items]        
Earnings invested in the business $ 1,157.2   $ 1,138.1  
Revenue 1,382.6 $ 1,369.9    
Americas        
Revenue from Contract with Customer [Line Items]        
Revenue 1,107.1 1,068.0    
Americas | Global Talent Solutions        
Revenue from Contract with Customer [Line Items]        
Revenue 484.4 468.6    
EMEA        
Revenue from Contract with Customer [Line Items]        
Revenue 270.0 296.8    
EMEA | Global Talent Solutions        
Revenue from Contract with Customer [Line Items]        
Revenue 11.1 12.1    
Deferred Sales Commissions        
Revenue from Contract with Customer [Line Items]        
Capitalized contract cost 2.0   2.3  
Capitalized contract cost, amortization 0.5 0.4    
Deferred Fulfillment Costs        
Revenue from Contract with Customer [Line Items]        
Capitalized contract cost 2.5   $ 3.0  
Capitalized contract cost, amortization $ 3.4 $ 2.1    
Accounting Standards Update 2014-09        
Revenue from Contract with Customer [Line Items]        
Earnings invested in the business       $ 3.4
Difference between Revenue Guidance in Effect before and after Topic 606        
Revenue from Contract with Customer [Line Items]        
Contract with customer, asset, gross       5.2
Deferred tax liabilities, net       1.2
Transferred at Point in Time | Difference between Revenue Guidance in Effect before and after Topic 606        
Revenue from Contract with Customer [Line Items]        
Deferred revenue       $ 0.6