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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Shares Used in the Earnings Per Share Calculation The number of shares used in the earnings per share calculations are reconciled as follows:
 
For the three months ended September 30
For the nine months ended September 30
(in millions)
2020
2019
2020
2019
Weighted-average basic shares outstanding
135.2

138.1

135.9

139.3

Dilutive effect of stock options
0.6

0.6

0.5

0.5

Weighted-average diluted shares outstanding
135.8

138.7

136.4

139.8