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Acquisitions (Details) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 USD ($) | Sep. 30, 2011 USD ($) | Jun. 30, 2011 USD ($) | Mar. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Sep. 30, 2010 USD ($) | Jun. 30, 2010 USD ($) | Mar. 31, 2010 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2010 COMSYS [Member] USD ($) | Dec. 31, 2011 COMSYS [Member] USD ($) | Apr. 05, 2010 COMSYS [Member] USD ($) | Dec. 31, 2011 Proservia SA [Member] EUR (€) | Nov. 30, 2011 Proservia SA [Member] USD ($) | Nov. 30, 2011 Proservia SA [Member] EUR (€) | Sep. 22, 2011 Proservia SA [Member] EUR (€) | Dec. 31, 2011 All Other Acquisitions [Member] USD ($) | Dec. 31, 2010 All Other Acquisitions [Member] USD ($) | Dec. 31, 2009 All Other Acquisitions [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  |  | 2010-04-05 |  |  | 2011-09-22 |  |  |  |  |  |
Percent of shares and voting rights acquired (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 70.00% |  |  |
Value of common stock acquired (price per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.65 |  |  | € 14.89 | € 14.89 |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 427.0 |  | $ 29.4 | € 21.6 |  | $ 19.6 | $ 32.3 | $ 21.6
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) |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |
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 COMSYS' Assets Acquired and Liabilities Assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 207.0 |  |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.1 |  |  |  |  |  |  |
Total current assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 210.0 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 281.6 | 278.0 | 281.6 |  |  | 20.7 | 20.7 | 12.9 |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | 106.3 | 85.4 | 127.1 | 10.8 |  |  | 11.0 | 4.5 |  |
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 |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  | 127.1 |  |  |  |  |  |  |
Estimated useful life of finite-lived intangibles (in years) |  |  |  |  |  |  |  |  |  |  |  | 14.0 |  |  |  |  |  |  |  |  |
Goodwill | 984.7 |  |  |  | 954.1 |  |  |  | 984.7 | 954.1 | 959.1 |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  |  |  |  |  |  |  |  |  |  | 28.2 |  |  |  |  |  |  |  |
Revenues from services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma |  |  |  |  |  |  |  |  |  | 19,036.1 | 16,688.0 |  |  |  |  |  |  |  |  |  |
As reported | 5,484.0 | 5,782.3 | 5,667.3 | 5,072.4 | 5,209.6 | 4,972.0 | 4,585.6 | 4,099.3 | 22,006.0 | 18,866.5 | 16,038.7 |  |  |  |  |  |  |  |  |  |
Net earnings / (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma |  |  |  |  |  |  |  |  |  | (269.9) | (27.9) |  |  |  |  |  |  |  |  |  |
As reported | $ 63.6 | $ 79.6 | $ 72.7 | $ 35.7 | $ (350.4) | $ 51.3 | $ 32.7 | $ 2.8 | $ 251.6 | $ (263.6) | $ (9.2) |  |  |  |  |  |  |  |  |  |
Net earnings / (loss) per share - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (3.30) | $ (0.34) |  |  |  |  |  |  |  |  |  |
As reported (in dollars per share) | $ 0.78 | $ 0.97 | $ 0.87 | $ 0.43 | $ (4.29) | $ 0.62 | $ 0.40 | $ 0.04 | $ 3.04 | $ (3.26) | $ (0.12) |  |  |  |  |  |  |  |  |  |

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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 55 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(2, 3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 53 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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