Earnings Per Share

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Earnings Per Share

Earnings per Share

The denominator for basic and diluted earnings per share for the three months ended March 31, 2014 and 2013 is as follows:

	Three Months Ended   March 31
	2014	2013
Denominator for basic earnings per share – weighted-average shares	284.9	303.2
Effect of dilutive securities – employee stock options, non-vested restricted stock awards and convertible debentures	7.7	2.7
Denominator for diluted earnings per share	292.6	305.9

During the three months ended March 31, 2014 and 2013, weighted-average shares related to certain stock options of 0.6 and 11.5, respectively, were excluded from the denominator for diluted earnings per share because the stock options were anti-dilutive.

During the three months ended March 31, 2014, we issued approximately 1.3 restricted stock units under our stock incentive plans, 0.7 of which vesting is contingent upon us meeting specified annual operating gain targets for 2014. The contingent restricted stock units have been excluded from the denominator for diluted earnings per share and will be included only if and when the contingency is met.