Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

At June 30, 2018, the number of shares outstanding was 142.5 million (June 30, 2017 - 146.1 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 June 30		For the six months ended June 30
(in millions)	2018	2017	2018	2017
Weighted-average basic shares outstanding	142.8	146.5	143.6	146.5
Dilutive effect of stock options	0.4	0.4	0.4	0.5
Weighted-average diluted shares outstanding	143.2	146.9	144.0	147.0

For the three and six months ended June 30, 2018, there were 0.1 million and 0.2 million options, respectively, excluded from the computation of diluted earnings per share because their effects were not dilutive (three and six months ended June 30, 2017 - 0.3 million and 0.4 million).