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Severance, acquisition and other costs (Tables) | 6 Months Ended
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Jun. 30, 2018
Analysis of income and expense [abstract] |
Disclosure of severance, acquisition and other costs |
| THREE MONTHS | SIX MONTHS
FOR THE PERIOD ENDED JUNE 30 | 2018 |  | 2017 |  | 2018 |  | 2017 |
Severance | (15 | ) | (16 | ) | (24 | ) | (47 | )
Acquisition and other | (9 | ) | (20 | ) | — |  | (73 | )
Total severance, acquisition and other costs | (24 | ) | (36 | ) | (24 | ) | (120 | )

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