Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 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 March 31
(in millions)	2016	2015
Weighted-average basic shares outstanding	153.0	164.9
Dilutive effect of stock options	0.8	1.4
Weighted-average diluted shares outstanding	153.8	166.3