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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Denominator for Basic and Diluted Earnings Per Share
The denominator for basic and diluted earnings per share for the three and six months ended June 30, 2015 and 2014 is as follows:
 
Three Months Ended 
 June 30

Six Months Ended 
 June 30
 
2015
 
2014
 
2015
 
2014
Denominator for basic earnings per share – weighted-average shares
263.1

 
276.8

 
264.8

 
280.8

Effect of dilutive securities – employee stock options, non-vested restricted stock awards and convertible debentures
11.2

 
9.2

 
12.5

 
8.5

Denominator for diluted earnings per share
274.3

 
286.0

 
277.3

 
289.3