Contingencies (Details) - Shareholder class action lawsuits - item |
6 Months Ended | |
|---|---|---|
Aug. 30, 2013 |
Jun. 30, 2016 |
|
| Contingencies | ||
| Number of notices of actions relating to Canadian securities class action claims | 3 | |
| Number of actions were succeeded by specific action with an amended claim | 3 | |
| Number of actions by which specific Ontario actions were succeeded | 1 | |
| Number of pending matters having material adverse impact on financial position or results of operations or have been reserved | 0 |