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New Accounting Standards ASC 606 Adoption (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jan. 01, 2016
Trade receivables, net of allowances $ 1,508.0   $ 1,508.0   $ 1,739.4  
Notes and other receivables 296.1   296.1   385.3  
Accounts Receivable, Reimbursed by Client, Current 1,301.5   1,301.5   1,263.3  
Contract with Customer, Asset, Net, Current 264.0   264.0   178.4  
Other Assets, Current         389.1  
Long-term receivables 175.5   175.5   164.7  
Other Assets, Noncurrent 155.9   155.9   155.5  
Accounts Payable and Accrued Liabilities, Current 966.4   966.4   993.1  
Accounts Payable, Reimbursed by Client, Current 899.8   899.8   1,022.6  
Accrued compensation & benefits 973.8   973.8   1,419.1  
Short-term contract liabilities and deferred income 180.5   180.5   155.4  
Other Liabilities, Current 203.1   203.1   256.8  
Deferred tax liabilities, net 23.9   23.9   63.2  
Retained earnings 2,778.4   2,778.4   2,649.0  
Accumulated Other Comprehensive Income (Loss), Net of Tax (391.6)   (391.6)   (340.8)  
Revenue Before Reimbursements 2,163.3 $ 1,874.5 4,054.4 $ 3,490.8    
Reimbursement Revenue 1,740.4 1,595.8 3,404.5 3,097.2    
Revenue 3,903.7 3,470.3 7,458.9 6,588.0    
Compensation and benefits 1,240.5 1,066.4 2,337.7 2,044.0    
Operating, administrative and other 737.8 630.7 1,435.1 1,210.2    
Cost of Reimbursable Expense 1,740.4 1,595.8 3,404.5 3,097.2    
Operating Income (Loss) 149.8 130.8 203.6 146.2    
Other Nonoperating Income 1.7 0.0 4.2 1.0    
Provision for income taxes 37.6 35.8 51.1 37.1    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 109.8 $ 94.9 $ 152.4 $ 102.6    
Basic earnings per common share (in dollars per share) $ 2.37 $ 2.08 $ 3.26 $ 2.24    
Diluted earnings per common share (in dollars per share) $ 2.35 $ 2.06 $ 3.23 $ 2.22    
Transition Adjustments [Member]            
Cost of Reimbursable Expense   $ 12.3   $ 30.2    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Trade receivables, net of allowances         2,118.1  
Notes and other receivables         393.6  
Other Assets, Current         257.7  
Long-term receivables         168.6  
Other Assets, Noncurrent         97.8  
Accounts Payable and Accrued Liabilities, Current         1,011.6  
Accrued compensation & benefits         1,309.0  
Short-term contract liabilities and deferred income         158.9  
Other Liabilities, Current         263.8  
Deferred tax liabilities, net         23.9  
Retained earnings         2,552.8  
Accumulated Other Comprehensive Income (Loss), Net of Tax         (341.8)  
Revenue Before Reimbursements   1,834.7   3,449.9    
Revenue   1,834.7   3,449.9    
Compensation and benefits   1,049.0   2,014.3    
Operating, administrative and other   634.8   1,218.6    
Operating Income (Loss)   104.3   126.6    
Other Nonoperating Income   0.0   0.0    
Provision for income taxes   25.5   29.1    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 78.7   $ 90.0    
Basic earnings per common share (in dollars per share)   $ 1.73   $ 1.97    
Diluted earnings per common share (in dollars per share)   $ 1.71   $ 1.95    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]            
Trade receivables, net of allowances         (378.7)  
Notes and other receivables         (8.3)  
Accounts Receivable, Reimbursed by Client, Current         1,263.3  
Contract with Customer, Asset, Net, Current         178.4  
Other Assets, Current         131.4  
Long-term receivables         (3.9)  
Other Assets, Noncurrent         57.7  
Accounts Payable and Accrued Liabilities, Current         (18.5)  
Accounts Payable, Reimbursed by Client, Current         1,022.6  
Accrued compensation & benefits         110.1  
Short-term contract liabilities and deferred income         (3.5)  
Other Liabilities, Current         (7.0)  
Deferred tax liabilities, net         39.3  
Retained earnings         96.2  
Accumulated Other Comprehensive Income (Loss), Net of Tax         $ 1.0  
Revenue Before Reimbursements   $ 39.8   $ 40.9    
Reimbursement Revenue   1,595.8   3,097.2    
Revenue   1,635.6   3,138.1    
Compensation and benefits   17.4   28.7    
Operating, administrative and other   (4.1)   (8.4)    
Cost of Reimbursable Expense   1,595.8   3,097.2    
Operating Income (Loss)   26.5   20.6    
Other Nonoperating Income   0.0   0.0    
Provision for income taxes   10.3   8.0    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 16.2   $ 12.6    
Basic earnings per common share (in dollars per share)   $ 0.35   $ 0.27    
Diluted earnings per common share (in dollars per share)   $ 0.35   $ 0.27    
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]            
Retained earnings           $ 62.6
Adjustments for New Accounting Pronouncement [Member]            
Revenue Before Reimbursements   $ 0.0   $ 0.0    
Reimbursement Revenue   0.0   0.0    
Revenue   0.0   0.0    
Compensation and benefits   0.0   1.0    
Operating, administrative and other   0.0   0.0    
Cost of Reimbursable Expense   0.0   0.0    
Operating Income (Loss)   0.0   (1.0)    
Other Nonoperating Income   0.0   1.0    
Provision for income taxes   0.0   0.0    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 0.0   $ 0.0    
Basic earnings per common share (in dollars per share)   $ 0.00   $ 0.00    
Diluted earnings per common share (in dollars per share)   $ 0.00   $ 0.00