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Quarterly Data (Unaudited) (Details) (USD $)
In Millions, except Per Share data, 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
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