Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

At September 30, 2018, the number of shares outstanding was 142.6 million (September 30, 2017 - 145.0 million).

Basic earnings per share have 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 earnings per share calculations is reconciled as follows:

	For the three months ended September 30		For the nine months ended September 30
(in millions)	2018	2017	2018	2017
Weighted-average basic shares outstanding	142.6	145.5	143.2	146.2
Dilutive effect of stock options	0.5	0.3	0.5	0.4
Weighted-average diluted shares outstanding	143.1	145.8	143.7	146.6

For the three and nine months ended September 30, 2018, there were 0.3 million and 0.2 million options, respectively, excluded from the computation of diluted earnings per share because their effects were not dilutive (three and nine months ended September 30, 2017 - 0.3 million and 0.3 million).