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Severance, acquisition and other costs (Tables)
 6 Months Ended
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
)