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Summary of Significant Accounting Policies, Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Restructuring costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs | $ 26.5 |  | $ 8.1 | $ 20.0 | $ 34.8 |  | $ 26.6 |  | $ 1.2 | $ 20.9 | $ 0.1 |  | $ 89.4 |  | $ 48.8 |  | $ 23.1
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 41.4 |  |  |  |  |  | 29.4 |  | 41.4 |  | 29.4 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 62.3 |  | 29.2 |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 27.1 |  | 19.6 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (82.4) |  | (36.8) |  |
Balance, end of year | 48.4 |  |  |  |  |  | 41.4 |  |  |  |  |  | 48.4 |  | 41.4 |  | 29.4
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 3.8 |  |  |  |  |  | 3.3 |  | 3.8 |  | 3.3 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 7.8 |  | 3.4 |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 1.8 |  | 4.0 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (8.3) |  | (6.9) |  |
Balance, end of year | 5.1 |  |  |  |  |  | 3.8 |  |  |  |  |  | 5.1 |  | 3.8 |  |
France [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 3.8 |  |  |  |  |  | 3.5 |  | 3.8 |  | 3.5 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 |  |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 |  | 1.7 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (2.5) |  | (1.4) |  |
Balance, end of year | 3.5 |  |  |  |  |  | 3.8 |  |  |  |  |  | 3.5 |  | 3.8 |  |
Italy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0.9 |  |  |  |  |  | 0.4 |  | 0.9 |  | 0.4 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 3.4 |  | 0.7 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (3.4) |  | (0.2) |  |
Balance, end of year | 0.9 |  |  |  |  |  | 0.9 |  |  |  |  |  | 0.9 |  | 0.9 |  |
Americas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.5 | [1] |  |  |  |  | 4.0 | [1] | 4.5 | [1] | 4.0 | [1] |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 15.2 | [1] | 5.8 | [1] |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 2.8 | [1] | 4.0 | [1] |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (15.7) | [1] | (9.3) | [1] |
Balance, end of year | 6.8 | [1] |  |  |  |  | 4.5 | [1] |  |  |  |  | 6.8 | [1] | 4.5 | [1] |
Southern Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.7 | [2] |  |  |  |  | 4.2 | [2] | 4.7 | [2] | 4.2 | [2] |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 6.2 | [2] | 2.1 | [2] |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 | [2] | 1.7 | [2] |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (8.0) | [2] | (3.3) | [2] |
Balance, end of year | 4.5 | [2] |  |  |  |  | 4.7 | [2] |  |  |  |  | 4.5 | [2] | 4.7 | [2] |
Northern Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 15.6 |  |  |  |  |  | 11.8 |  | 15.6 |  | 11.8 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 24.7 |  | 8.3 |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 14.3 |  | 4.9 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (32.4) |  | (9.4) |  |
Balance, end of year | 22.2 |  |  |  |  |  | 15.6 |  |  |  |  |  | 22.2 |  | 15.6 |  |
APME [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0 |  |  |  |  |  | 1.2 |  | 0 |  | 1.2 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 2.7 |  | 0.7 |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 3.5 |  | 0 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (4.4) |  | (1.9) |  |
Balance, end of year | 1.8 |  |  |  |  |  | 0 |  |  |  |  |  | 1.8 |  | 0 |  |
Right Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 6.6 |  |  |  |  |  | 8.2 |  | 6.6 |  | 8.2 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 9.1 |  | 3.1 |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 4.9 |  | 7.8 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (8.3) |  | (12.5) |  |
Balance, end of year | 12.3 |  |  |  |  |  | 6.6 |  |  |  |  |  | 12.3 |  | 6.6 |  |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 10.0 |  |  |  |  |  | 0 |  | 10.0 |  | 0 |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 4.4 |  | 9.2 |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 1.2 |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (13.6) |  | (0.4) |  |
Balance, end of year | $ 0.8 |  |  |  |  |  | $ 10.0 |  |  |  |  |  | $ 0.8 |  | $ 10.0 |  |
[1] | Balance related to United States was $3.3 as of January 1, 2012. In 2012, United States incurred $3.4 for severance costs and $4.0 for office closure costs and paid/utilized $6.9, leaving a $3.8 liability as of December 31, 2012. In 2013, United States incurred $7.8 for severance costs and $1.8 for office closure costs and paid/utilized $8.3, leaving a $5.1 liability as of December 31, 2013.
[2] | Balance related to France was $3.5 as of January 1, 2012. In 2012, France incurred $1.7 for office closure costs and paid/utilized $1.4, leaving a $3.8 liability as of December 31, 2012. In 2013, France incurred $0.6 for severance costs and $1.6 for office closure costs and paid/utilized $2.5, leaving a $3.5 liability as of December 31, 2013. Italy had a $0.4 liability as of January 1, 2012. In 2012, Italy incurred $0.7 for severance costs and paid $0.2, leaving a $0.9 liability as of December 31, 2012. In 2013, Italy recorded severance costs of $3.4 and paid out $3.4, leaving a $0.9 liability as of December 31, 2013.

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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