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ACCOUNTING POLICIES (Employee liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Deferred compensation share-based arrangements, liability | $ 30.8 | $ 23.4
Stock granted, value | $ 30.3 | $ 24.1
Incentive Retention Program | Capital Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period (years) | 4 years |
Redemption, period (years) | 10 years |
Early redemption, period (years) | 7 years |

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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 Deferred Compensation Share-based Arrangements, Liability + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Early Redemption, Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Redemption, Period + References No definition available. + Details
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- Definition Stock Granted, Value, Share-based Compensation, Gross + References No definition available. + Details
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- Details
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- Details
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Period Type: |