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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 |  |

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