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Earnings Per Share
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share Earnings per share

Basic earnings per share has been calculated using Net income for the period divided by the weighted-average number of shares outstanding during the period. 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



For the three and six months ended June 30, 2020, there were 0.2 million options excluded from the computation of diluted earnings per share because their effects were not dilutive (three and six months ended June 30, 2019 - nil and 0.1 million, respectively).