Earnings Per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Earnings Per Share

Earnings per Share

The denominator for basic and diluted earnings per share at December 31 is as follows:

	2014	2013	2012
Denominator for basic earnings per share—weighted-average shares	275.9	298.5	321.5
Effect of dilutive securities—employee stock options, non-vested restricted stock awards and convertible debentures	10.0	5.3	3.3
Denominator for diluted earnings per share	285.9	303.8	324.8

During the years ended December 31, 2014, 2013 and 2012, weighted-average shares related to certain stock options of 0.5, 4.2 and 12.6, respectively, were excluded from the denominator for diluted earnings per share because the stock options were anti-dilutive.