Earnings Per Share (Tables)

6 Months Ended

Jun. 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 June 30		For the six months ended June 30
(in millions)	2016	2015	2016	2015
Weighted-average basic shares outstanding	151.7	163.7	152.3	164.3
Dilutive effect of stock options	0.9	1.3	0.9	1.4
Weighted-average diluted shares outstanding	152.6	165.0	153.2	165.7