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PENSIONS AND POSTRETIREMENT BENEFITS (Effect of Fair Value Measurements Using Significant Unobservable Inputs (Level 3) on Changes in Pension Plan Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The following represents the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets for the years ended December 31, 2015 and 2014:
| (In Millions)
| Year Ended December 31, 2015
| Hedge Funds |  | Private Equity Funds |  | Structured Credit Fund |  | Real Estate |  | Total
Beginning balance — January 1, 2015 | $ | 41.5 |  |  | $ | 31.2 |  |  | $ | 65.4 |  |  | $ | 50.0 |  |  | $ | 188.1 |
Actual return on plan assets: |  |  |  |  |  |  |  |  |
Relating to assets still held at the reporting date | (0.8 | ) |  | 1.5 |  |  | (3.3 | ) |  | 8.1 |  |  | 5.5 |
Relating to assets sold during the period | — |  |  | 2.5 |  |  | — |  |  | — |  |  | 2.5 |
Purchases | — |  |  | 5.7 |  |  | — |  |  | — |  |  | 5.7 |
Sales | — |  |  | (7.8 | ) |  | — |  |  | (0.6 | ) |  | (8.4 | )
Ending balance — December 31, 2015 | $ | 40.7 |  |  | $ | 33.1 |  |  | $ | 62.1 |  |  | $ | 57.5 |  |  | $ | 193.4 |
| (In Millions)
| Year Ended December 31, 2014
| Hedge Funds |  | Private Equity Funds |  | Structured Credit Fund |  | Real Estate |  | Total
Beginning balance — January 1, 2014 | $ | 38.8 |  |  | $ | 29.1 |  |  | $ | 61.0 |  |  | $ | 40.9 |  |  | $ | 169.8 |
Actual return on plan assets: |  |  |  |  |  |  |  |  |
Relating to assets still held at the reporting date | 2.7 |  |  | 3.2 |  |  | 4.4 |  |  | 5.2 |  |  | 15.5 |
Relating to assets sold during the period | — |  |  | 3.0 |  |  | — |  |  | — |  |  | 3.0 |
Purchases | — |  |  | 1.4 |  |  | — |  |  | 5.4 |  |  | 6.8 |
Sales | — |  |  | (5.5 | ) |  | — |  |  | (1.5 | ) |  | (7.0 | )
Ending balance — December 31, 2014 | $ | 41.5 |  |  | $ | 31.2 |  |  | $ | 65.4 |  |  | $ | 50.0 |  |  | $ | 188.1 |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | $ 188.1 | $ 169.8
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 5.5 | 15.5
Relating to assets sold during the period | 2.5 | 3.0
Purchases | 5.7 | 6.8
Sales | (8.4) | (7.0)
Fair value of plan assets — end of year | 193.4 | 188.1
Hedge Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 41.5 | 38.8
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | (0.8) | 2.7
Relating to assets sold during the period | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales | 0.0 | 0.0
Fair value of plan assets — end of year | 40.7 | 41.5
Private Equity Funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 31.2 | 29.1
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 1.5 | 3.2
Relating to assets sold during the period | 2.5 | 3.0
Purchases | 5.7 | 1.4
Sales | (7.8) | (5.5)
Fair value of plan assets — end of year | 33.1 | 31.2
Structured Finance [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 65.4 | 61.0
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | (3.3) | 4.4
Relating to assets sold during the period | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales | 0.0 | 0.0
Fair value of plan assets — end of year | 62.1 | 65.4
Real Estate [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | 50.0 | 40.9
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 8.1 | 5.2
Relating to assets sold during the period | 0.0 | 0.0
Purchases | 0.0 | 5.4
Sales | (0.6) | (1.5)
Fair value of plan assets — end of year | $ 57.5 | $ 50.0
Veba Trust [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The following represents the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets for the year ended December 31, 2015 and 2014:
| (In Millions)
| Year Ended December 31, 2015
| Hedge Funds |  | Private Equity Funds |  | Structured Credit Fund |  | Real Estate |  | Total
Beginning balance — January 1, 2015 | $ | 11.5 |  |  | $ | 6.2 |  |  | $ | 6.1 |  |  | $ | 8.7 |  |  | $ | 32.5 |
Actual return on plan assets: |  |  |  |  |  |  |  |  |
Relating to assets still held at the reporting date | (0.3 | ) |  | 0.3 |  |  | (0.3 | ) |  | 1.3 |  |  | 1.0 |
Relating to assets sold during the period | — |  |  | 0.4 |  |  | — |  |  | — |  |  | 0.4 |
Purchases | — |  |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Sales | — |  |  | (1.5 | ) |  | — |  |  | — |  |  | (1.5 | )
Ending balance — December 31, 2015 | $ | 11.2 |  |  | $ | 5.5 |  |  | $ | 5.8 |  |  | $ | 10.0 |  |  | $ | 32.5 |
| (In Millions)
| Year Ended December 31, 2014
| Hedge Funds |  | Private Equity Funds |  | Structured Credit Fund |  | Real Estate |  | Total
Beginning balance — January 1, 2014 | $ | 24.6 |  |  | $ | 6.0 |  |  | $ | 13.5 |  |  | $ | 13.2 |  |  | $ | 57.3 |
Actual return on plan assets: |  |  |  |  |  |  |  |  |
Relating to assets still held at the reporting date | 0.5 |  |  | 1.0 |  |  | 0.4 |  |  | 0.9 |  |  | 2.8 |
Relating to assets sold during the period | 0.6 |  |  | 0.4 |  |  | 0.4 |  |  | 0.5 |  |  | 1.9 |
Purchases | — |  |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |
Sales | (14.2 | ) |  | (1.3 | ) |  | (8.2 | ) |  | (5.9 | ) |  | (29.6 | )
Ending balance — December 31, 2014 | $ | 11.5 |  |  | $ | 6.2 |  |  | $ | 6.1 |  |  | $ | 8.7 |  |  | $ | 32.5 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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