Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

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)	2018	2017	2018	2017
Weighted-average basic shares outstanding	142.8	146.5	143.6	146.5
Dilutive effect of stock options	0.4	0.4	0.4	0.5
Weighted-average diluted shares outstanding	143.2	146.9	144.0	147.0