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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, 2017 | Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | $ 202.4 | $ 193.4
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 16.1 | 12.3
Purchases | 57.9 | 8.0
Sales | 65.6 | 14.6
Fair value of plan assets — end of year | 215.6 | 202.4
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 | 40.6 | 40.7
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 2.5 | (0.1)
Purchases | 39.0 | 0.0
Sales | 45.1 | 0.0
Fair value of plan assets — end of year | 37.4 | 40.6
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 | 36.1 | 33.1
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 0.3 | (2.7)
Purchases | 4.5 | 8.0
Sales | 5.6 | 6.0
Fair value of plan assets — end of year | 39.8 | 36.1
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 | 63.8 | 62.1
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 9.1 | 10.0
Purchases | 0.0 | 0.0
Sales | 0.0 | 8.0
Fair value of plan assets — end of year | 72.9 | 63.8
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 | 61.9 | 57.5
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 4.2 | 5.1
Purchases | 14.4 | 0.0
Sales | 14.9 | 0.6
Fair value of plan assets — end of year | $ 65.5 | $ 61.9

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in plan assets of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in plan assets of defined benefit plan from disposal or classification as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: 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=82843861&loc=d3e1928-114920 + Details
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