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New Accounting Standards ASC 606 Adoption (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Trade receivables, net of allowances $ 1,475.5   $ 1,739.4
Notes and other receivables 339.9   385.3
Accounts Receivable, Reimbursed by Client, Current 1,288.6   1,263.3
Contract with Customer, Asset, Net, Current 209.7   178.4
Other Assets, Current     389.1
Long-term receivables 174.1   164.7
Other Assets, Noncurrent 164.9   155.5
Accounts Payable and Accrued Liabilities, Current 979.7   993.1
Accounts Payable, Reimbursed by Client, Current 881.1   1,022.6
Accrued compensation & benefits 976.9   1,419.1
Short-term contract liabilities and deferred income 169.2   155.4
Other Liabilities, Current 253.5   256.8
Deferred tax liabilities, net 23.9   63.2
Retained earnings 2,689.3   2,649.0
Accumulated Other Comprehensive Income (Loss), Net of Tax (289.0)   (340.8)
Revenue Before Reimbursements 1,891.1 $ 1,616.3  
Reimbursement Revenue 1,664.1 1,501.4  
Revenue, consolidated VIE 3,555.2 3,117.7  
Compensation and benefits 1,097.2 977.6  
Operating, administrative and other 697.3 579.5  
Cost of Reimbursable Expense 1,664.1 1,501.4  
Operating Income (Loss) 53.8 15.4  
Other Nonoperating Income 2.5 1.0  
Provision for income taxes 13.5 1.3  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 42.6 $ 7.7  
Basic earnings per common share (in dollars per share) $ 0.89 $ 0.16  
Diluted earnings per common share (in dollars per share) $ 0.88 $ 0.16  
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   $ 1,615.2  
Revenue, consolidated VIE   1,615.2  
Compensation and benefits   965.3  
Operating, administrative and other   583.8  
Operating Income (Loss)   22.3  
Other Nonoperating Income   0.0  
Provision for income taxes   3.6  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 11.3  
Basic earnings per common share (in dollars per share)   $ 0.24  
Diluted earnings per common share (in dollars per share)   $ 0.24  
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   $ 1.1  
Reimbursement Revenue   1,501.4  
Revenue, consolidated VIE   1,502.5  
Compensation and benefits   11.3  
Operating, administrative and other   4.3  
Cost of Reimbursable Expense   1,501.4  
Operating Income (Loss)   (5.9)  
Other Nonoperating Income   0.0  
Provision for income taxes   (2.3)  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ (3.6)  
Basic earnings per common share (in dollars per share)   $ (0.08)  
Diluted earnings per common share (in dollars per share)   $ (0.08)  
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Retained earnings     $ 62.6
Cost of Reimbursable Expense   $ 14.9  
Adjustments for New Accounting Pronouncement [Member]      
Revenue Before Reimbursements   0.0  
Reimbursement Revenue   0.0  
Revenue, consolidated VIE   0.0  
Compensation and benefits   1.0  
Operating, administrative and other   0.0  
Cost of Reimbursable Expense   0.0  
Operating Income (Loss)   (1.0)  
Other Nonoperating Income   1.0  
Provision for income taxes   0.0  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 0.0  
Basic earnings per common share (in dollars per share)   $ 0.00  
Diluted earnings per common share (in dollars per share)   $ 0.00