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Acquisitions (Details) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2012 USD ($) | Sep. 30, 2012 USD ($) | Jun. 30, 2012 USD ($) | Mar. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Sep. 30, 2011 USD ($) | Jun. 30, 2011 USD ($) | Mar. 31, 2011 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Apr. 16, 2012 Damilo Group [Member] USD ($) | Apr. 16, 2012 Damilo Group [Member] EUR (€) | Dec. 31, 2012 Damilo Group [Member] USD ($) | Dec. 31, 2012 Damilo Group [Member] EUR (€) | Apr. 05, 2010 COMSYS [Member] USD ($) | Dec. 31, 2012 COMSYS [Member] USD ($) | Dec. 31, 2011 COMSYS [Member] USD ($) | Dec. 31, 2010 COMSYS [Member] USD ($) | Sep. 22, 2011 Proservia SA [Member] USD ($) | Sep. 22, 2011 Proservia SA [Member] EUR (€) | Nov. 30, 2011 Proservia SA [Member] USD ($) | Nov. 30, 2011 Proservia SA [Member] EUR (€) | Dec. 31, 2012 Proservia SA [Member] USD ($) | Dec. 31, 2012 Proservia SA [Member] EUR (€) | Dec. 31, 2011 Proservia SA [Member] USD ($) | Dec. 31, 2011 Proservia SA [Member] EUR (€) | Dec. 31, 2012 All Other Acquisitions [Member] USD ($) | Dec. 31, 2011 All Other Acquisitions [Member] USD ($) | Dec. 31, 2010 All Other Acquisitions [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 16, 2012 | Apr. 16, 2012 | Apr. 16, 2012 | Apr. 16, 2012 | Apr. 05, 2010 | Apr. 05, 2010 | Apr. 05, 2010 | Apr. 05, 2010 | Sep. 22, 2011 | Sep. 22, 2011 | Sep. 22, 2011 | Sep. 22, 2011 | Sep. 22, 2011 | Sep. 22, 2011 | Sep. 22, 2011 | Sep. 22, 2011 |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28.0 | € 21.2 |  |  |  |  |  |  |  |  | $ 29.4 | € 21.6 |  |  |  |  | $ 21.0 | $ 19.6 | $ 32.3
Assumed liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44.6 | 33.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired, net of goodwill, related intangible assets and cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23.6 | 17.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of shares and voting rights acquired (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% | 70.00% | 100.00% | 100.00% |  |  |  |  |  |  |
Value of common stock acquired (price per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.65 |  |  |  |  |  | $ 19.93 | € 14.89 |  |  |  |  |  |  |
Business acquisition, debt repaid upon closing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consideration paid in common stock (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid in common stock, number of shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid, equity portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 188.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consideration paid in cash (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs associated with the acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.8 |  |  |  |  |  |  |  |  |  |  |
Capital charges assumption as a percent of revenue (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |
Discount rate used in valuation of assets and liabilities acquired (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.00% |  |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  |  |  |  |  |  |  | 23.6 |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 207.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 210.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.6 | 30.8 |  |  | 281.6 | 278.0 | 278.0 |  | 27.7 | 20.7 |  |  |  |  |  |  | 5.6 |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.0 | 6.3 | 7.6 | 5.8 | 127.1 | 67.1 | 85.4 |  | 14.7 | 11.0 |  |  | 12.4 | 9.4 | 14.0 | 10.8 | 0 |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 674.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee compensation payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 247.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 427.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of finite-lived intangibles (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from services [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,036.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As reported | 5,202.6 |  | 5,172.3 |  | 5,206.7 |  | 5,096.4 |  | 5,484.0 |  | 5,782.3 |  | 5,667.3 |  | 5,072.4 |  | 20,678.0 | [1] | 22,006.0 | [1] | 18,866.5 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (269.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As reported | $ 53.3 |  | $ 63.1 |  | $ 41.0 |  | $ 40.2 |  | $ 63.6 |  | $ 79.6 |  | $ 72.7 |  | $ 35.7 |  | $ 197.6 |  | $ 251.6 |  | $ (263.6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings per share diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3.3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As reported (in dollars per share) | $ 0.68 | [2] | $ 0.79 | [2] | $ 0.51 | [2] | $ 0.50 | [2] | $ 0.78 | [3] | $ 0.97 | [3] | $ 0.87 | [3] | $ 0.43 | [3] | $ 2.47 | [2] | $ 3.04 | [3] | $ (3.26) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Further breakdown of revenues from services by geographical region is as follows: Revenues from Services 2012, 2011, 2010: United States $ 3,132.0, $ 3,254.6, $ 2,940.1; France 5,448.3, 6,201.9, 5,240.7; Italy 1,061.6, 1,277.1, 1,065.0; United Kingdom 1,898.1, 1,880.4, 1,822.2; Total Foreign 17,546.0, 18,751.4, 15,926.4.
[2] | Included in the results are reorganization costs of ($0.17) per diluted share in the second quarter and ($0.23) per diluted share in the fourth quarter.
[3] | Included in the results are reorganization costs of ($0.02) per diluted share in the second quarter and ($0.20) per diluted share in the fourth quarter.

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