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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Number of Shares Used in the Earnings Per Share Calculation 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)
2019
2018
2019
2018
Weighted-average basic shares outstanding
139.7

142.8

139.9

143.6

Dilutive effect of stock options
0.5

0.4

0.5

0.4

Weighted-average diluted shares outstanding
140.2

143.2

140.4

144.0