Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

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 June 30		For the six months ended June 30
(in millions)	2017	2016	2017	2016
Weighted-average basic shares outstanding	146.5	151.7	146.5	152.3
Dilutive effect of stock options	0.4	0.9	0.5	0.9
Weighted-average diluted shares outstanding	146.9	152.6	147.0	153.2