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PENSION AND POST-RETIREMENT PLANS - RETURN ON PLAN ASSETS (Details) - Pension Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Change in Plan Assets: |  |
Balance at the beginning of the period | $ 186.7 | $ 178.8
Actual return (loss) on plan assets: |  |
Balance at the end of the period | 162.2 | 186.7
Significant Unobservable Inputs (Level 3) | Private equity partnership interests |  |
Change in Plan Assets: |  |
Balance at the beginning of the period | 0.1 | 0.1
Actual return (loss) on plan assets: |  |
Assets held at the reporting date | 0.5 | 0.1
Assets sold during the period | (0.4) | (0.1)
Purchases, sales and settlements, net | (0.2) |
Balance at the end of the period |  | 0.1
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) |  |
Change in Plan Assets: |  |
Balance at the beginning of the period | 11.2 | 10.9
Actual return (loss) on plan assets: |  |
Assets held at the reporting date | 1.0 | 0.4
Assets sold during the period | 0.1 | 0.4
Purchases, sales and settlements, net | (0.7) | (0.5)
Balance at the end of the period | 11.6 | 11.2
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Real estate partnerships interests |  |
Change in Plan Assets: |  |
Balance at the beginning of the period | 11.1 | 10.8
Actual return (loss) on plan assets: |  |
Assets held at the reporting date | 0.5 | 0.3
Assets sold during the period | 0.5 | 0.5
Purchases, sales and settlements, net | (0.5) | (0.5)
Balance at the end of the period | $ 11.6 | $ 11.1

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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 sold. + 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, 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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