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CAPITAL AND FINANCIAL RISK MANAGEMENT - Energy price risk (Details) $ in Millions	Dec. 31, 2018 USD ($)
Capital and financial risk management
Percentage of increase in price	10.00%
Percentage of decrease in price	10.00%
10% increase in price | WTI oil
Capital and financial risk management
Increase in price effect on OCI before tax, gain (loss)	$ 7.5
10% decrease in price | WTI oil
Capital and financial risk management
Decrease in price effect on OCI before tax, gain (loss)	$ (7.5)

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- Definition

The increase (decrease) in other comprehensive income as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period.

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- Definition

The increase (decrease) in other comprehensive income as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period.

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- Definition

The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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- Definition

The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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