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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, 2018 | Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Roll Forward] |  |
Fair value of plan assets — beginning of year | $ 215.6 | $ 202.4
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 12.5 | 16.1
Purchases | 5.2 | 57.9
Sales | 8.2 | 65.6
Fair value of plan assets — end of year | 229.1 | 215.6
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 | 37.4 | 40.6
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | (0.2) | 2.5
Purchases | 0.0 | 39.0
Sales | 0.0 | 45.1
Fair value of plan assets — end of year | 37.2 | 37.4
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 | 39.8 | 36.1
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 1.4 | 0.3
Purchases | 5.2 | 4.5
Sales | 7.8 | 5.6
Fair value of plan assets — end of year | 42.6 | 39.8
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 | 72.9 | 63.8
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 5.9 | 9.1
Purchases | 0.0 | 0.0
Sales | 0.0 | 0.0
Fair value of plan assets — end of year | 78.8 | 72.9
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 | 65.5 | 61.9
Actual return on plan assets: |  |
Relating to assets still held at the reporting date | 5.4 | 4.2
Purchases | 0.0 | 14.4
Sales | 0.4 | 14.9
Fair value of plan assets — end of year | $ 70.5 | $ 65.5

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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