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Summary of significant accounting policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 contract
Disclosure of detailed information about intangible assets [line items] |
Number of power agreements | 2
Bottom of range | Trademarks |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 10 years
Bottom of range | Software |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 3 years
Top of range | Trademarks |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 20 years
Top of range | Software |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 5 years
Expiration date 2018 |
Disclosure of detailed information about intangible assets [line items] |
Power agreement term (in years) | 10 years
Expiration date 2024 |
Disclosure of detailed information about intangible assets [line items] |
Power agreement term (in years) | 15 years
Expiration date 2025 |
Disclosure of detailed information about intangible assets [line items] |
Power agreement term (in years) | 15 years

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