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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2021
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)20212020
Weighted-average basic shares outstanding133.3 136.7 
Dilutive effect of stock options0.6 0.5 
Weighted-average diluted shares outstanding133.9 137.2