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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share  
Component of income from continuing operations and share data used in basic and diluted earnings per share

 

In millions, except share and per share amounts
  2013   2012   2011  

Numerator:

                    

Income from continuing operations

   $ 235.2   $ 228.7   $ 172.0  

Less: dividends declared—common stock outstanding, unvested restricted shares and restricted share units

     (53.7 )   (48.0 )   (43.5 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Undistributed earnings

     181.5     180.7     128.5  

Percent allocated to common shareholders(1)

     99.5 %   99.4 %   99.0 %
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     180.6     179.7     127.3  

Add: dividends declared—common stock

     53.4     47.7     43.1  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Numerator for basic and diluted EPS

   $ 234.0   $ 227.4   $ 170.4  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Denominator (in thousands):

                    

Denominator for basic EPS: weighted-average common shares outstanding

     63,471     62,513     61,457  

Effect of dilutive securities:

                    

Performance awards

     416     399     318  

Stock options

     919     698     720  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Denominator for diluted EPS: adjusted weighted average common shares outstanding and assumed conversion

     64,806     63,610     62,495  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Per share income from continuing operations:

                    

Basic

   $ 3.69   $ 3.64   $ 2.77  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Diluted

   $ 3.61   $ 3.57   $ 2.73  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

 
    
    
    
    
  

(1)

  

Basic weighted-average common shares outstanding

     63,471     62,513     61,457  

 

  

Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units

     63,797     62,871     62,047  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

  

Percent allocated to common shareholders

     99.5 %   99.4 %   99.0 %
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Component of income (loss) from discontinued operations and share data used in basic and diluted earnings per share

 

In millions, except share amounts
  2013   2012   2011  

Income (loss) from discontinued operations attributable to common shareholders for basic and diluted earnings per share

   $ (25.4 ) $ 41.2   $ 8.2  

Net income attributable to common shareholders for basic and diluted earnings per share

   $ 208.6   $ 268.5   $ 178.6  

Antidilutive stock options excluded from EPS calculation(1)

     —     —     200.0  
(1)
Represents stock options excluded from the calculation of diluted earnings per share as such options had exercise prices in excess of the weighted-average market price of the Company's common stock during these periods. Amounts in thousands.