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Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Nature of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offices worldwide | 3,500 |  |  |  |  |  |  |  |  |  |  |  | 3,500 |  |  |  |  |
Number of countries and territories | 80 |  |  |  |  |  |  |  |  |  |  |  | 80 |  |  |  |  |
Basis of consolidation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest to qualify for equity method, maximum (in hundredths) | 50.00% |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Ownership interest to qualify for equity method, minimum (in hundredths) | 20.00% |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Carrying value of equity method investments | $ 85.3 |  |  |  |  |  | $ 75.9 |  |  |  |  |  | $ 85.3 |  | $ 75.9 |  | $ 71.6 |
Unremitted earnings from equity method investments |  |  |  |  |  |  |  |  |  |  |  |  | 67.2 |  | 64.7 |  |  |
Revenues and receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Franchise fees |  |  |  |  |  |  |  |  |  |  |  |  | 23.9 |  | 25.2 |  | 23.6 |
Deferred revenue - current | 55.7 |  |  |  |  |  | 54.3 |  |  |  |  |  | 55.7 |  | 54.3 |  |  |
Deferred revenue - non-current | 17.1 |  |  |  |  |  | 28.6 |  |  |  |  |  | 17.1 |  | 28.6 |  |  |
Allowance for doubtful accounts [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  | 29.2 |  | 25.9 |  | 28.9 |
Write-offs of accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  | 23.2 |  | 25.0 |  | 33.5 |
Advertising costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expenses |  |  |  |  |  |  |  |  |  |  |  |  | 27.2 |  | 34.0 |  | 29.2 |
Reorganization costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization costs | 26.6 |  | 1.2 | 20.9 | 0.1 |  | 21.0 |  | 0.5 | 1.4 | 0.2 |  | 48.8 |  | 23.1 |  | 36.1 |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 29.4 |  |  |  |  |  | 34.2 |  | 29.4 |  | 34.2 |  |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 29.2 |  | 12.3 |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 19.6 |  | 10.8 |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (36.8) |  | (27.9) |  |  |
Balance, end of year | 41.4 |  |  |  |  |  | 29.4 |  |  |  |  |  | 41.4 |  | 29.4 |  | 34.2 |
Fair value of goodwill and tradenames [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (311.6) |
Intangible assets impairment losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (117.2) |
Goodwill and intangible asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (428.8) |
Non-cash impairment charges, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 311.6 |
Non-cash impairment charges, excluding goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.7 |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Gross | 1,041.3 | [1] |  |  |  |  | 984.7 | [1] |  |  |  |  | 1,041.3 | [1] | 984.7 | [1] |  |
Accumulated Amortization | 0 | [1] |  |  |  |  | 0 | [1] |  |  |  |  | 0 | [1] | 0 | [1] |  |
Goodwill, Net | 1,041.3 | [1],[2] |  |  |  |  | 984.7 | [1],[2] |  |  |  |  | 1,041.3 | [1],[2] | 984.7 | [1],[2] | 954.1 | [2]
Accumulated impairment loss of goodwill | 513.4 |  |  |  |  |  | 513.4 |  |  |  |  |  | 513.4 |  | 513.4 |  | 513.4 |
Income approach weight for goodwill impairment for certain reporting units (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |
Market approach weight for goodwill impairment for certain reporting units (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 391.8 |  |  |  |  |  | 379.1 |  |  |  |  |  | 391.8 |  | 379.1 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 213.2 |  |  |  |  |  | 176.1 |  |  |  |  |  | 213.2 |  | 176.1 |  |  |
Finite-Lived Intangible Assets, Net | 178.6 |  |  |  |  |  | 203.0 |  |  |  |  |  | 178.6 |  | 203.0 |  |  |
Indefinite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 152.0 |  |  |  |  |  | 151.9 |  |  |  |  |  | 152.0 |  | 151.9 |  |  |
Accumulated Amortization on Infinite Intangible Assets | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 152.0 |  |  |  |  |  | 151.9 |  |  |  |  |  | 152.0 |  | 151.9 |  |  |
Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill), Total | 543.8 |  |  |  |  |  | 531.0 |  |  |  |  |  | 543.8 |  | 531.0 |  |  |
Intangible Assets, Accumulated Amortization (Excluding Goodwill), Total | 213.2 |  |  |  |  |  | 176.1 |  |  |  |  |  | 213.2 |  | 176.1 |  |  |
Intangible Assets, Net (Excluding Goodwill) | 330.6 |  |  |  |  |  | 354.9 |  |  |  |  |  | 330.6 |  | 354.9 |  |  |
Amortization expense related to intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 36.7 | [3] | 38.9 | [3] | 39.3 | [3]
Future amortization expense [Abstract} |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 32.9 |  |  |  |  |  |  |  |  |  |  |  | 32.9 |  |  |  |  |
2014 | 27.9 |  |  |  |  |  |  |  |  |  |  |  | 27.9 |  |  |  |  |
2015 | 24.8 |  |  |  |  |  |  |  |  |  |  |  | 24.8 |  |  |  |  |
2016 | 20.8 |  |  |  |  |  |  |  |  |  |  |  | 20.8 |  |  |  |  |
2017 | 18.9 |  |  |  |  |  |  |  |  |  |  |  | 18.9 |  |  |  |  |
Number of reporting units experiencing strong indicators of impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Marketable securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments market value | 0 |  |  |  |  |  | 0.4 |  |  |  |  |  | 0 |  | 0.4 |  |  |
Available-for-sale investments adjusted cost basis | 0 |  |  |  |  |  | 0.1 |  |  |  |  |  | 0 |  | 0.1 |  |  |
Available-for-sale investments realized gains or losses |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 |  | 0 |  | 0 |
Available-for-sale investments unrealized loss |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |
Ownership interest in our Swiss franchise (in hundredths) | 49.00% |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |
Swiss Franchise Investment Market Value | 192.5 |  |  |  |  |  | 175.8 |  |  |  |  |  | 192.5 |  | 175.8 |  |  |
Swiss franchise realized gains |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  | 0.1 |  | 0.5 |
Swiss franchise realized losses |  |  |  |  |  |  |  |  |  |  |  |  | 0.2 |  | 0.3 |  | 0.2 |
Capitalized software for internal use [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Software, Useful Life, Minimum |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Capitalized Software, Useful Life, Maximum |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Net capitalized software | 10.6 |  |  |  |  |  | 14.4 |  |  |  |  |  | 10.6 |  | 14.4 |  |  |
Amortization expense related to the capitalized software costs |  |  |  |  |  |  |  |  |  |  |  |  | 7.3 |  | 7.8 |  | 11.6 |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, gross | 704.1 |  |  |  |  |  | 685.6 |  |  |  |  |  | 704.1 |  | 685.6 |  |  |
Share Repurchase Programs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3.6 |  | 2.6 |  | 0.9 |
Total cost of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  | 138.2 |  | 104.5 |  | 34.8 |
Dividends declared (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.86 |  | $ 0.80 |  | $ 0.74 |
Total dividend paid |  |  |  |  |  |  |  |  |  |  |  |  | 67.8 |  | 65.1 |  | 60.8 |
Authorized in 2007 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Programs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2 |  | 0.9 |
Authorized in 2010 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Programs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 |
Shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 |  | 2.4 |  |  |
Authorized in 2011 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Programs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 3.0 |  |  |  |  |  |  |  | 3.0 |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |  |  |
Authorized in 2012 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Programs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) | 8.0 |  |  |  |  |  |  |  |  |  |  |  | 8.0 |  |  |  |  |
Land [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, gross | 6.8 |  |  |  |  |  | 7.3 |  |  |  |  |  | 6.8 |  | 7.3 |  |  |
Building [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, gross | 21.0 |  |  |  |  |  | 21.5 |  |  |  |  |  | 21.0 |  | 21.5 |  |  |
Furniture, Fixtures and Autos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, gross | 198.4 |  |  |  |  |  | 194.9 |  |  |  |  |  | 198.4 |  | 194.9 |  |  |
Computer Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, gross | 169.2 |  |  |  |  |  | 164.4 |  |  |  |  |  | 169.2 |  | 164.4 |  |  |
Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, gross | 308.7 |  |  |  |  |  | 297.5 |  |  |  |  |  | 308.7 |  | 297.5 |  |  |
Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 54.0 | [4] |  |  |  |  | 54.0 | [4] |  |  |  |  | 54.0 | [4] | 54.0 | [4] |  |
Accumulated Amortization on Infinite Intangible Assets | 0 | [4] |  |  |  |  | 0 | [4] |  |  |  |  | 0 | [4] | 0 | [4] |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 54.0 | [4] |  |  |  |  | 54.0 | [4] |  |  |  |  | 54.0 | [4] | 54.0 | [4] |  |
Accumulated Impairment Loss | 139.5 |  |  |  |  |  | 139.5 |  |  |  |  |  | 139.5 |  | 139.5 |  |  |
Reacquired Franchise Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 98.0 |  |  |  |  |  | 97.9 |  |  |  |  |  | 98.0 |  | 97.9 |  |  |
Accumulated Amortization on Infinite Intangible Assets | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 98.0 |  |  |  |  |  | 97.9 |  |  |  |  |  | 98.0 |  | 97.9 |  |  |
Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 19.6 |  |  |  |  |  | 19.6 |  |  |  |  |  | 19.6 |  | 19.6 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 19.6 |  |  |  |  |  | 19.6 |  |  |  |  |  | 19.6 |  | 19.6 |  |  |
Finite-Lived Intangible Assets, Net | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Weighted-average useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Franchise Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 18.0 |  |  |  |  |  | 18.0 |  |  |  |  |  | 18.0 |  | 18.0 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 16.1 |  |  |  |  |  | 14.3 |  |  |  |  |  | 16.1 |  | 14.3 |  |  |
Finite-Lived Intangible Assets, Net | 1.9 |  |  |  |  |  | 3.7 |  |  |  |  |  | 1.9 |  | 3.7 |  |  |
Weighted-average useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 339.0 |  |  |  |  |  | 328.0 |  |  |  |  |  | 339.0 |  | 328.0 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 165.1 |  |  |  |  |  | 130.1 |  |  |  |  |  | 165.1 |  | 130.1 |  |  |
Finite-Lived Intangible Assets, Net | 173.9 |  |  |  |  |  | 197.9 |  |  |  |  |  | 173.9 |  | 197.9 |  |  |
Weighted-average useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 14 years |  |  |  |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 15.2 |  |  |  |  |  | 13.5 |  |  |  |  |  | 15.2 |  | 13.5 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 12.4 |  |  |  |  |  | 12.1 |  |  |  |  |  | 12.4 |  | 12.1 |  |  |
Finite-Lived Intangible Assets, Net | 2.8 |  |  |  |  |  | 1.4 |  |  |  |  |  | 2.8 |  | 1.4 |  |  |
Weighted-average useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 10.60% |  |  |  |  |
Minimum [Member] | Furniture, Fixtures and Autos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Minimum [Member] | Computer Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 16.90% |  |  |  |  |
Maximum [Member] | Building [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |
Maximum [Member] | Furniture, Fixtures and Autos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 16 years |  |  |  |  |
Maximum [Member] | Computer Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 16 years |  |  |  |  |
Carrying Amount [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,438.2 |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro-denominated notes | 725.5 |  |  |  |  |  | 647.6 |  |  |  |  |  | 725.5 |  | 647.6 |  |  |
Fair Value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,009.4 |
Fair Value Measurements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro-denominated notes | 778.8 |  |  |  |  |  | 654.9 |  |  |  |  |  | 778.8 |  | 654.9 |  |  |
Recurring Basis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | 0 |  |  |  |  |  | 0.4 |  |  |  |  |  | 0 |  | 0.4 |  |  |
Foreign currency forward contracts | 0.1 |  |  |  |  |  | 0 |  |  |  |  |  | 0.1 |  | 0 |  |  |
Deferred compensation plan assets | 58.7 |  |  |  |  |  | 45.2 |  |  |  |  |  | 58.7 |  | 45.2 |  |  |
Total assets measured at fair value | 58.8 |  |  |  |  |  | 45.6 |  |  |  |  |  | 58.8 |  | 45.6 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts | 0 |  |  |  |  |  | 0.3 |  |  |  |  |  | 0 |  | 0.3 |  |  |
Total liabilities | 0 |  |  |  |  |  | 0.3 |  |  |  |  |  | 0 |  | 0.3 |  |  |
Recurring Basis [Member] | Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | 0 |  |  |  |  |  | 0.4 |  |  |  |  |  | 0 |  | 0.4 |  |  |
Foreign currency forward contracts | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Deferred compensation plan assets | 58.7 |  |  |  |  |  | 45.2 |  |  |  |  |  | 58.7 |  | 45.2 |  |  |
Total assets measured at fair value | 58.7 |  |  |  |  |  | 45.6 |  |  |  |  |  | 58.7 |  | 45.6 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Total liabilities | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Recurring Basis [Member] | Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Foreign currency forward contracts | 0.1 |  |  |  |  |  | 0 |  |  |  |  |  | 0.1 |  | 0 |  |  |
Deferred compensation plan assets | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Total assets measured at fair value | 0.1 |  |  |  |  |  | 0 |  |  |  |  |  | 0.1 |  | 0 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts | 0 |  |  |  |  |  | 0.3 |  |  |  |  |  | 0 |  | 0.3 |  |  |
Total liabilities | 0 |  |  |  |  |  | 0.3 |  |  |  |  |  | 0 |  | 0.3 |  |  |
Recurring Basis [Member] | Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Foreign currency forward contracts | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Deferred compensation plan assets | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Total assets measured at fair value | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Total liabilities | 0 |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  | 0 |  |  |
Non-recurring Basis [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of goodwill and tradenames [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 954.1 |
Tradenames |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.3 |
Non-recurring Basis [Member] | Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of goodwill and tradenames [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Tradenames |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Non-recurring Basis [Member] | Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of goodwill and tradenames [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Tradenames |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Non-recurring Basis [Member] | Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of goodwill and tradenames [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 954.1 |
Tradenames |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.3 |
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 3.3 |  |  |  |  |  | 7.4 |  | 3.3 |  | 7.4 |  |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 3.4 |  | 1.3 |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  | 0.3 |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (6.9) |  | (5.7) |  |  |
Balance, end of year | 3.8 |  |  |  |  |  | 3.3 |  |  |  |  |  | 3.8 |  | 3.3 |  |  |
France [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 3.5 |  |  |  |  |  | 5.6 |  | 3.5 |  | 5.6 |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 1.7 |  | 0.4 |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (1.4) |  | (2.5) |  |  |
Balance, end of year | 3.8 |  |  |  |  |  | 3.5 |  |  |  |  |  | 3.8 |  | 3.5 |  |  |
Italy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0.4 |  |  |  |  |  | 0 |  | 0.4 |  | 0 |  |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |  | 0.9 |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (0.2) |  | (0.5) |  |  |
Balance, end of year | 0.9 |  |  |  |  |  | 0.4 |  |  |  |  |  | 0.9 |  | 0.4 |  |  |
Americas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.0 | [5] |  |  |  |  | 7.4 | [5] | 4.0 | [5] | 7.4 | [5] |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 5.8 | [5] | 2.1 | [5] |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 | [5] | 0.3 | [5] |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (9.3) | [5] | (5.8) | [5] |  |
Balance, end of year | 4.5 | [5] |  |  |  |  | 4.0 | [5] |  |  |  |  | 4.5 | [5] | 4.0 | [5] |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | 467.1 | [6] |  |  |  |  | 461.8 | [6] |  |  |  |  | 467.1 | [6] | 461.8 | [6] | 465.5 | [6]
Southern Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 4.2 | [7] |  |  |  |  | 5.6 | [7] | 4.2 | [7] | 5.6 | [7] |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 2.1 | [7] | 1.1 | [7] |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 1.7 | [7] | 0.4 | [7] |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (3.3) | [7] | (2.9) | [7] |  |
Balance, end of year | 4.7 | [7] |  |  |  |  | 4.2 | [7] |  |  |  |  | 4.7 | [7] | 4.2 | [7] |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | 103.3 | [8] |  |  |  |  | 59.5 | [8] |  |  |  |  | 103.3 | [8] | 59.5 | [8] | 33.1 | [8]
Northern Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 11.8 |  |  |  |  |  | 5.0 |  | 11.8 |  | 5.0 |  |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 8.3 |  | 5.5 |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 4.9 |  | 7.7 |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (9.4) |  | (6.4) |  |  |
Balance, end of year | 15.6 |  |  |  |  |  | 11.8 |  |  |  |  |  | 15.6 |  | 11.8 |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | 270.7 |  |  |  |  |  | 260.7 |  |  |  |  |  | 270.7 |  | 260.7 |  | 265.1 |
APME [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 1.2 |  |  |  |  |  | 0.7 |  | 1.2 |  | 0.7 |  |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |  | 0.5 |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (1.9) |  | 0 |  |  |
Balance, end of year | 0 |  |  |  |  |  | 1.2 |  |  |  |  |  | 0 |  | 1.2 |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | 73.2 |  |  |  |  |  | 77.5 |  |  |  |  |  | 73.2 |  | 77.5 |  | 64.9 |
Right Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 8.2 |  |  |  |  |  | 14.4 |  | 8.2 |  | 14.4 |  |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 3.1 |  | 3.1 |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 7.8 |  | 2.4 |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (12.5) |  | (11.7) |  |  |
Balance, end of year | 6.6 |  |  |  |  |  | 8.2 |  |  |  |  |  | 6.6 |  | 8.2 |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | 62.1 |  |  |  |  |  | 60.3 |  |  |  |  |  | 62.1 |  | 60.3 |  | 60.6 |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  | 0 |  |  |  |  |  | 1.1 |  | 0 |  | 1.1 |  |  |
Severance costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 9.2 |  | 0 |  |  |
Office closure costs, net |  |  |  |  |  |  |  |  |  |  |  |  | 1.2 |  |  |  |  |
Costs paid or utilized |  |  |  |  |  |  |  |  |  |  |  |  | (0.4) |  | (1.1) |  |  |
Balance, end of year | 10.0 |  |  |  |  |  | 0 |  |  |  |  |  | 10.0 |  | 0 |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | 64.9 | [2],[9] |  |  |  |  | 64.9 | [2],[9] |  |  |  |  | 64.9 | [2],[9] | 64.9 | [2],[9] | 64.9 | [2],[9]
Allowance for Doubtful Accounts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  | 29.2 |  | 25.9 |  | 28.9 |
Write-offs of accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.2 |  | $ 25.0 |  | $ 33.5 |
[1] | Balances were net of accumulated impairment loss of $513.4 as of both December 31, 2012 and 2011.
[2] | Balances were net of accumulated impairment loss of $513.4 as of January 1, 2011, December 31, 2011 and December 31, 2012.
[3] | Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[4] | Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2012 and 2011.
[5] | Balance related to United States was $7.4 as of January 1, 2011. In 2011, United States incurred $1.3 for severance costs and $0.3 for office closure costs and paid/utilized $5.7, leaving a $3.3 liability as of December 31, 2011. 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.
[6] | Balances related to United States were $451.7, $448.3 and $448.5 as of January 1, 2011, December 31, 2011 and December 31, 2012, respectively.
[7] | Balance related to France was $5.6 as of January 1, 2011. In 2011, France incurred $0.4 for office closure costs and paid/utilized $2.5, leaving a $3.5 liability as of December 31, 2011. 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. Italy had no reorganization liability as of January 1, 2011. In 2011, Italy recorded severance costs of $0.9 and paid out $0.5, leaving a $0.4 liability as of December 31, 2011. In 2012, Italy incurred $0.7 for severance costs and paid $0.2, leaving a $0.9 liability as of December 31, 2012.
[8] | Balances related to France were $15.8, $42.1 and $83.8 as of January 1, 2011, December 31, 2011 and December 31, 2012, respectively. Balances related to Italy were $4.6, $5.4 and $5.5 as of January 1, 2011, December 31, 2011 and December 31, 2012, respectively.
[9] | The majority of the Corporate balance as of December 31, 2012 relates to goodwill attributable to our acquisition of Jefferson Wells ($55.5) which is part of the United States reporting unit. For purposes of monitoring our total assets by segment, we do not allocate the Corporate balance to the respective reportable segments. We do, however, include these balances within the appropriate reporting units for our goodwill impairment testing. See the table below for the breakout of goodwill balances by reporting unit.

X
- Definition Accumulated Amortization on Infinite Intangible Assets. + References No definition available. + Details
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Namespace Prefix: | man_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | man_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | man_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum useful life of capitalized software used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | man_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum useful life of capitalized software used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | man_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References No definition available. + Details
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Namespace Prefix: | man_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | man_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Accumulated amortization of goodwill. + References No definition available. + Details
Name: | man_GoodwillAccumulatedAmortization
Namespace Prefix: | man_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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 132R -Paragraph 5 -Subparagraph b -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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