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Critical accounting estimates and judgments - Summary of Key Assumptions (Details) | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Disclosure of information for cash-generating units [line items] |  |
Future pricing increases as a percentage | 3.00% | 1.00%
Future cost increases as a percentage | 3.00% | 1.00%
Discount rates | 6.22% | 6.50%
Perpetuity growth rate | 2.00% | 2.00%
UMA |  |
Disclosure of information for cash-generating units [line items] |  |
Financial projections (in years) | 4 years | 4 years
AVI |  |
Disclosure of information for cash-generating units [line items] |  |
Financial projections (in years) | 7 years | 7 years
Bottom of range |  |
Disclosure of information for cash-generating units [line items] |  |
Yield average growth rates | 0.00% | 0.00%
Top of range |  |
Disclosure of information for cash-generating units [line items] |  |
Yield average growth rates | 1.00% | 1.00%

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