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Net Earnings Per Common Share (Tables)
9 Months Ended
Sep. 30, 2011
Net Earnings Per Common Share [Abstract] 
Calculation of basic and diluted net earnings per common share
                                 
    Three Months     Nine Months  
    Ended     Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Basic Net Earnings Per Common Share:
                               
Numerator
                               
Net earnings available to common stockholders
  $ 73.7     $ 76.5     $ 198.4     $ 204.6  
Distributed and allocated undistributed net earnings to non-vested restricted stockholders
    (0.4 )     (0.4 )     (1.2 )     (1.3 )
 
                       
Distributed and allocated undistributed net earnings to common stockholders
    73.3       76.1       197.2       203.3  
Distributed net earnings—dividends paid to common stockholders
    (20.7 )     (20.6 )     (62.1 )     (58.6 )
 
                       
Allocation of undistributed net earnings to common stockholders
  $ 52.6     $ 55.5     $ 135.1     $ 144.7  
 
                       
Denominator
                               
Weighted average number of common shares outstanding—basic (1)
    159.3       158.3       159.1       158.2  
 
                       
 
                               
Basic net earnings per common share:
                               
Distributed net earnings to common stockholders
  $ 0.13     $ 0.13     $ 0.39     $ 0.37  
Allocated undistributed net earnings to common stockholders
    0.33       0.35       0.85       0.92  
 
                       
Basic net earnings per common share:
  $ 0.46     $ 0.48     $ 1.24     $ 1.29  
 
                       
Diluted Net Earnings Per Common Share:
                               
Numerator
                               
Distributed and allocated undistributed net earnings to common stockholders
  $ 73.3     $ 76.1     $ 197.2     $ 203.3  
Add: Allocated undistributed net earnings to non-vested restricted stockholders
    0.4       0.4       0.9       1.0  
Less: Undistributed net earnings reallocated to non-vested restricted stockholders
    (0.3 )     (0.3 )     (0.8 )     (0.9 )
 
                       
Net earnings available to common stockholders—diluted
  $ 73.4     $ 76.2     $ 197.3     $ 203.4  
 
                       
Denominator
                               
Weighted average number of common shares outstanding—basic
    159.3       158.3       159.1       158.2  
Effect of assumed issuance of Settlement agreement shares
    18.0       18.0       18.0       18.0  
Effect of non-vested restricted stock and restricted stock units
    0.6       0.4       0.4       0.2  
 
                       
Weighted average number of common shares outstanding—diluted
    177.9       176.7       177.5       176.4  
 
                       
Diluted net earnings per common share
  $ 0.41     $ 0.43     $ 1.11     $ 1.15