PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Additional Information) (Details) - USD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2017 |
Dec. 31, 2016 |
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| Pension Benefits [Member] | Ìý | Ìý |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | Ìý | Ìý |
| Actual return on plan assets | $ 100.2 | $ 54.8 |
| Other Benefits [Member] | Ìý | Ìý |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | Ìý | Ìý |
| Actual return on plan assets | $ 24.2 | $ 16.0 |
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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