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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 June 30
For the six months ended June 30
(in millions)
2020
2019
2020
2019
Weighted-average basic shares outstanding
135.6

139.7

136.1

139.9

Dilutive effect of stock options
0.5

0.5

0.5

0.5

Weighted-average diluted shares outstanding
136.1

140.2

136.6

140.4