Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Number of Shares Used In the Earnings Per Share Calculations

The number of shares used in earnings per share calculations is reconciled as follows:

	For the three months ended September 30		For the nine months ended September 30
(in millions)	2016	2015	2016	2015
Weighted-average basic shares outstanding	147.3	157.6	150.7	162.0
Dilutive effect of stock options	1.0	1.1	0.9	1.3
Weighted-average diluted shares outstanding	148.3	158.7	151.6	163.3