At December 31, 2014, 1.1 million (December 31, 2013 — 1.0 million) DSUs were outstanding.

For the fourth quarter and full year 2014, we recorded employee stock-based compensation expense (excluding DSUs) of $5.9 and $28.4, respectively (fourth quarter and full year 2013 — $6.6 and $29.2, respectively), and DSU expense of $0.5 and $1.9, respectively (fourth quarter and full year 2013 — $0.6 and $1.9, respectively). The amount of our employee stock-based compensation expense varies from period-to-period. The portion of our expense that relates to performance-based compensation generally varies depending on the level of achievement of pre-determined performance goals and financial targets.

Weighted average number of shares outstanding:

The weighted average number of shares used for the diluted per share calculations include the effect of stock-based compensation awards, if dilutive. For the fourth quarter of 2014, we excluded the effect of 2.0 million such awards as they were anti-dilutive due to the loss reported in the period.

8. PENSION AND NON-PENSION POST-EMPLOYMENT BENEFIT PLANS

We provide pension and non-pension post-employment defined benefit plans for our employees. Our obligations are determined based on actuarial valuations. We recognize actuarial gains or losses arising from pension and non-pension post-employment defined benefit plans in other comprehensive income and we subsequently reclassify the amounts to deficit. For 2014, we recognized $11.9 of net actuarial gains, net of tax (2013 — $7.6 of net actuarial gains, net of tax). We used a measurement date of December 31, 2014 for the accounting valuation of our pension and non-pension post-employment defined benefit plans.

Also see note 9(c).

9. OTHER CHARGES

(a) Restructuring:

Our restructuring charges (recoveries) are comprised of the following:

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