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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31
(in millions)
2020
2019
Weighted-average basic shares outstanding
136.7

140.1

Dilutive effect of stock options
0.5

0.4

Weighted-average diluted shares outstanding
137.2

140.5