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Summary of Significant Accounting Policies - Restructuring Costs (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Costs [Abstract] |  |  |  |
Restructuring costs | $ 16,400,000 | $ 16,400,000 |  | $ 89,400,000
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 12,900,000 | $ 48,400,000 |
Costs paid or utilized |  | (12,900,000) | (35,500,000) |
Severance costs |  | 13,100,000 |  |
Office closure costs |  | 3,300,000 |  |
Balance at end of year | 16,400,000 | 16,400,000 | 12,900,000 | 48,400,000
Reportable segments | Americas |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 1,100,000 | 6,800,000 |
Costs paid or utilized |  | (800,000) | (5,700,000) |
Severance costs |  | 2,500,000 |  |
Office closure costs |  | 700,000 |  |
Balance at end of year | 3,500,000 | 3,500,000 | 1,100,000 | 6,800,000
Reportable segments | Americas | United States | Reportable subsegments |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 1,000,000 | 5,100,000 |
Costs paid or utilized |  | (1,100,000) | (4,100,000) |
Severance costs |  | 2,300,000 |  |
Office closure costs |  | 700,000 |  |
Balance at end of year | 2,900,000 | 2,900,000 | 1,000,000 | 5,100,000
Reportable segments | Southern Europe |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 2,300,000 | 4,500,000 |
Costs paid or utilized |  | (600,000) | (2,200,000) |
Severance costs |  | 0 |  |
Office closure costs |  | 0 |  |
Balance at end of year | 1,700,000 | 1,700,000 | 2,300,000 | 4,500,000
Reportable segments | Southern Europe | France | Reportable subsegments |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 2,100,000 | 3,500,000 |
Costs paid or utilized |  | (600,000) | (1,400,000) |
Balance at end of year | 1,500,000 | 1,500,000 | 2,100,000 | 3,500,000
Reportable segments | Southern Europe | Italy | Reportable subsegments |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 0 | 900,000 |
Costs paid or utilized |  |  | (900,000) |
Balance at end of year | 0 | 0 | 0 | 900,000
Reportable segments | Northern Europe |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 5,800,000 | 22,200,000 |
Costs paid or utilized |  | (6,300,000) | (16,400,000) |
Severance costs |  | 8,600,000 |  |
Office closure costs |  | 400,000 |  |
Balance at end of year | 8,500,000 | 8,500,000 | 5,800,000 | 22,200,000
Reportable segments | APME |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 500,000 | 1,800,000 |
Costs paid or utilized |  | (1,700,000) | (1,300,000) |
Severance costs |  | 900,000 |  |
Office closure costs |  | 2,000,000 |  |
Balance at end of year | 1,700,000 | 1,700,000 | 500,000 | 1,800,000
Reportable segments | Right Management |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 2,300,000 | 12,300,000 |
Costs paid or utilized |  | (2,800,000) | (10,000,000) |
Severance costs |  | 1,100,000 |  |
Office closure costs |  | 200,000 |  |
Balance at end of year | 800,000 | 800,000 | 2,300,000 | 12,300,000
Corporate |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Balance at beginning of period |  | 900,000 | 800,000 |
Costs paid or utilized |  | (700,000) | 100,000 |
Severance costs |  | 0 |  |
Office closure costs |  | 0 |  |
Balance at end of year | $ 200,000 | $ 200,000 | $ 900,000 | $ 800,000

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