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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, 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
Quarterly Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services | $ 5,484.0 | $ 5,782.3 | $ 5,667.3 | $ 5,072.4 | $ 5,209.6 | $ 4,972.0 | $ 4,585.6 | $ 4,099.3 | $ 22,006.0 | $ 18,866.5 | $ 16,038.7
Gross profit | 935.2 | 951.3 | 962.2 | 857.6 | 905.7 | 841.2 | 797.0 | 701.5 | 3,706.3 | 3,245.4 | 2,818.2
Operating profit (loss) | 129.8 | 158.0 | 150.8 | 85.6 | (342.6) | 108.9 | 79.1 | 32.6 | 524.2 | (122.0) | 41.7
Net earnings / (loss) available to common shareholders | 63.6 | 79.6 | 72.7 | 35.7 | (350.4) | 51.3 | 32.7 | 2.8 | 251.6 | (263.6) | (9.2)
Net earnings (loss) per share - basic (in dollars per share) | $ 0.79 | $ 0.97 | $ 0.89 | $ 0.44 | $ (4.29) | $ 0.63 | $ 0.40 | $ 0.04 | $ 3.08 | $ (3.26) | $ (0.12)
Net earnings (loss) per share - diluted (in dollars per share) | $ 0.78 | $ 0.97 | $ 0.87 | $ 0.43 | $ (4.29) | $ 0.62 | $ 0.40 | $ 0.04 | $ 3.04 | $ (3.26) | $ (0.12)
Dividends per share (in dollars per share) | $ 0.40 | $ 0.00 | $ 0.40 | $ 0.00 | $ 0.37 | $ 0.00 | $ 0.37 | $ 0.00 | $ 0.80 | $ 0.74 |
High (in dollars per share) | $ 45.92 | $ 58.62 | $ 68.14 | $ 68.67 | $ 65.14 | $ 52.20 | $ 62.18 | $ 59.92 |  |  |
Low (in dollars per share) | $ 32.63 | $ 32.32 | $ 52.37 | $ 58.60 | $ 50.39 | $ 42.50 | $ 40.58 | $ 50.63 |  |  |
Impairment charge | 0 | 0 | 0 | 0 | 428.8 | 0 | 0 | 0 | 0 | 428.8 | 61.0
Reorganization charges | $ 21.0 | $ 0.5 | $ 1.4 | $ 0.2 | $ 28.0 | $ 5.6 | $ 1.2 | $ 1.3 | $ 23.1 | $ 36.1 | $ 33.5
Reorganization costs per diluted share (in dollars per share) | $ 0.20 | $ 0.00 | $ 0.02 | $ 0.00 | $ 0.23 | $ 0.05 | $ 0.01 | $ 0.01 |  |  |
Impairment charge per diluted share (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 4.70 | $ 0.00 | $ 0.00 | $ 0.00 |  |  |

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