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Repositioning Actions (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Repositioning Actions [Abstract] |  |  |  |  |  |  |  |  |  |  |
Severance |  |  |  | $ 92.8 |  |  |  |  |  |  |
Real estate lease terminations |  |  |  | 15.3 |  |  |  |  |  |  |
Asset and goodwill write-offs related to disposals and other costs |  |  |  | 23.2 |  |  |  |  |  |  |
Repositioning actions, total |  |  |  | 131.3 |  |  |  |  |  |  |
Severance payments related to repositioning actions |  |  |  |  |  |  |  |  | 92.8 |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Salary and service costs |  |  |  |  |  |  |  |  | 10,250.6 | 9,214.2 | 8,450.6
Office and general expenses |  |  |  |  |  |  |  |  | 1,950.8 | 1,868.1 | 1,895.2
Operating Expenses | 3,365.5 | 3,007.5 | 2,999.3 | 2,829.2 | 3,147.0 | 2,680.5 | 2,625.8 | 2,629.0 | 12,201.4 | 11,082.3 | 10,345.8
Repositioning Actions [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Salary and service costs |  |  |  |  |  |  |  |  | 92.8 |  |
Office and general expenses |  |  |  |  |  |  |  |  | 38.5 |  |
Operating Expenses |  |  |  |  |  |  |  |  | 131.3 |  |
Remeasurement Gain [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Office and general expenses |  |  |  |  |  |  |  |  | (123.4) |  |
Operating Expenses |  |  |  |  |  |  |  |  | $ (123.4) |  |

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