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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT (Capital risk narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Debt to capital ratio | 36.00% | 19.00% |
Reserve of cash flow hedges, net of tax | $ 0.6 | $ (0.1) | $ (0.4)
Cash flow hedges |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Reserve of cash flow hedges, net of tax | $ 0.7 |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Debt-To-Capital Ratio + References No definition available. + Details
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- Details
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