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Quarterly Data (Unaudited)
 12 Months Ended
Dec. 31, 2011
Quarterly Data (Unaudited) [Abstract]  
Quarterly Data (Unaudited)
15.
Quarterly Data (Unaudited)
 
   First Quarter   Second Quarter   Third Quarter   Fourth Quarter   Total  
Year Ended December 31, 2011                    
Revenues from services $ 5,072.4  $ 5,667.3  $ 5,782.3  $ 5,484.0  $ 22,006.0  
Gross profit  857.6   962.2   951.3   935.2   3,706.3  
Operating profit(a)  85.6   150.8   158.0   129.8   524.2  
Net earnings  35.7   72.7   79.6   63.6   251.6  
Net earnings per share — basic $ 0.44  $ 0.89  $ 0.97  $ 0.79  $ 3.08  
Net earnings per share — diluted(b)  0.43   0.87   0.97   0.78   3.04  
Dividends per share  –   0.40   –   0.40   0.80  
Market price:                     
High $ 68.67  $ 68.14  $ 58.62  $ 45.92      
Low  58.60   52.37   32.32   32.63      
Year Ended December 31, 2010                    
Revenues from services $ 4,099.3  $ 4,585.6  $ 4,972.0  $ 5,209.6  $ 18,866.5  
Gross profit  701.5   797.0   841.2   905.7   3,245.4  
Operating profit (loss)(c)  32.6   79.1   108.9   (342.6)  (122.0)
Net earnings (loss)  2.8   32.7   51.3   (350.4)  (263.6)
Net earnings (loss) per share — basic $ 0.04  $ 0.40  $ 0.63  $ (4.29) $ (3.26)
Net earnings (loss) per share — diluted(d)  0.04   0.40   0.62   (4.29)  (3.26)
Dividends per share  –   0.37   –   0.37   0.74  
Market price:                     
High $ 59.92  $ 62.18  $ 52.20  $ 65.14      
Low  50.63   40.58   42.50   50.39      

(a)
Included reorganization charges of $0.2, $1.4, $0.5 and $21.0 recorded in the first, second, third and fourth quarters, respectively.
(b)
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.
(c)
Included a $428.8 impairment charge recorded in the fourth quarter, and reorganization charges of $1.3, $1.2, $5.6 and $28.0 recorded in the first, second, third and fourth quarters, respectively.
(d)
The fourth quarter includes ($4.70) per share related to the impairment charge, Also included in the results are reorganization costs of ($0.01) per diluted share in the first and second quarters, ($0.05) per diluted share in the third quarter and ($0.23) per diluted share in the fourth quarter.