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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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 September 30
For the nine months ended September 30
(in millions)
2019
2018
2019
2018
Weighted-average basic shares outstanding
138.1

142.6

139.3

143.2

Dilutive effect of stock options
0.6

0.5

0.5

0.5

Weighted-average diluted shares outstanding
138.7

143.1

139.8

143.7