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Quarterly Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Quarterly Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from services | $ 5,202.6 |  | $ 5,172.3 |  | $ 5,206.7 |  | $ 5,096.4 |  | $ 5,484.0 |  | $ 5,782.3 |  | $ 5,667.3 |  | $ 5,072.4 |  | $ 20,678.0 | [1] | $ 22,006.0 | [1] | $ 18,866.5 | [1]
Gross profit | 876.7 |  | 856.2 |  | 861.7 |  | 847.4 |  | 935.2 |  | 951.3 |  | 962.2 |  | 857.6 |  | 3,442.0 |  | 3,706.3 |  | 3,245.4 |
Operating profit | 104.9 | [2] | 118.6 | [2] | 94.4 | [2] | 93.8 | [2] | 129.8 | [3] | 158.0 | [3] | 150.8 | [3] | 85.6 | [3] | 411.7 | [2] | 524.2 | [3] | (122.0) |
Net earnings (loss) | 53.3 |  | 63.1 |  | 41.0 |  | 40.2 |  | 63.6 |  | 79.6 |  | 72.7 |  | 35.7 |  | 197.6 |  | 251.6 |  | (263.6) |
Net earnings per share - basic (in dollars per share) | $ 0.68 |  | $ 0.79 |  | $ 0.51 |  | $ 0.50 |  | $ 0.79 |  | $ 0.97 |  | $ 0.89 |  | $ 0.44 |  | $ 2.49 |  | $ 3.08 |  | $ (3.26) |
Net earnings per share - diluted (in dollars per share) | $ 0.68 | [4] | $ 0.79 | [4] | $ 0.51 | [4] | $ 0.50 | [4] | $ 0.78 | [5] | $ 0.97 | [5] | $ 0.87 | [5] | $ 0.43 | [5] | $ 2.47 | [4] | $ 3.04 | [5] | $ (3.26) |
Dividends per share (in dollars per share) | $ 0.43 |  | $ 0 |  | $ 0.43 |  | $ 0 |  | $ 0.40 |  | $ 0 |  | $ 0.40 |  | $ 0 |  | $ 0.86 |  | $ 0.80 |  |  |
Market price [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) | $ 42.93 |  | $ 41.65 |  | $ 47.90 |  | $ 47.37 |  | $ 45.92 |  | $ 58.62 |  | $ 68.14 |  | $ 68.67 |  |  |  |  |  |  |
Low (in dollars per share) | $ 35.18 |  | $ 32.41 |  | $ 33.99 |  | $ 36.76 |  | $ 32.63 |  | $ 32.32 |  | $ 52.37 |  | $ 58.60 |  |  |  |  |  |  |
Reorganization charges | $ 26.6 |  | $ 1.2 |  | $ 20.9 |  | $ 0.1 |  | $ 21.0 |  | $ 0.5 |  | $ 1.4 |  | $ 0.2 |  | $ 48.8 |  | $ 23.1 |  | $ 36.1 |
Reorganization costs per diluted share (in dollars per share) | $ 0.23 |  | $ 0 |  | $ 0.17 |  | $ 0 |  | $ 0.20 |  | $ 0 |  | $ 0.02 |  | $ 0 |  |  |  |  |  |  |
[1] | Further breakdown of revenues from services by geographical region is as follows: Revenues from Services 2012, 2011, 2010: United States $ 3,132.0, $ 3,254.6, $ 2,940.1; France 5,448.3, 6,201.9, 5,240.7; Italy 1,061.6, 1,277.1, 1,065.0; United Kingdom 1,898.1, 1,880.4, 1,822.2; Total Foreign 17,546.0, 18,751.4, 15,926.4.
[2] | Included reorganization charges of $0.1, $20.9, $1.2 and $26.6 recorded in the first, second, third and fourth quarters, respectively.
[3] | Included reorganization charges of $0.2, $1.4, $0.5 and $21.0 recorded in the first, second, third and fourth quarters, respectively.
[4] | Included in the results are reorganization costs of ($0.17) per diluted share in the second quarter and ($0.23) per diluted share in the fourth quarter.
[5] | Included in the results are reorganization costs of ($0.02) per diluted share in the second quarter and ($0.20) per diluted share in the fourth quarter.

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