Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Denominator For Basic And Diluted Earnings Per Share

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

	2016	2015	2014
Denominator for basic earnings per share—weighted-average shares	262.9	263.0	275.9
Effect of dilutive securities—employee stock options, non-vested restricted stock awards and convertible debentures	5.2	9.9	10.0
Denominator for diluted earnings per share	268.1	272.9	285.9