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v3.19.1

Accounting policies (Details) | 12 Months Ended
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Dec. 31, 2018
Buildings [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Buildings [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 5 years
Plant and equipment | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Plant and equipment | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 4 years
Distribution system [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Distribution system [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Office furniture, fixtures and equipment [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Office furniture, fixtures and equipment [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Vehicles [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Vehicles [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Leasehold improvements [Member] |
Property, Plant and Equipment, Estimated Useful Lives | Shorter of 5 years or lease term
Lab equipment [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Lab equipment [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 5 years

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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