Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2018

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The effect of dilutive securities on the weighted average common shares outstanding included in the calculation of earnings per diluted common share for the three months ended March 31, 2018 and 2017 were as follows:



	Three Months Ended March 31
(number of shares in millions)	2018	2017
Weighted average common shares outstanding	249.8	257.6
Effect of dilutive securities:
Stock options	0.9	1.1
Other stock compensation awards	0.7	0.8
Potentially dilutive common shares	1.6	1.9
Adjusted weighted average common shares outstanding	251.4	259.5