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PENSION AND POST-RETIREMENT PLANS - RETURN ON PLAN ASSETS (Details) - Pensions - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Changes in plan assets: |  |
Balance at the beginning of the period | $ 168.9 | $ 178.9
Actual return (loss) on plan assets: |  |
Balance at the end of the period | 178.8 | 168.9
Significant Unobservable Inputs (Level 3) | Private equity partnership interests |  |
Changes in plan assets: |  |
Balance at the beginning of the period | 0.2 | 0.3
Actual return (loss) on plan assets: |  |
Assets held at the reporting date | (0.1) | (0.1)
Assets sold during the period | 0.1 |
Purchases, sales and settlements, net | (0.1) |
Balance at the end of the period | 0.1 | 0.2
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) |  |
Changes in plan assets: |  |
Balance at the beginning of the period | 10.5 | 9.6
Actual return (loss) on plan assets: |  |
Assets held at the reporting date | 0.5 | 1.0
Assets sold during the period | 0.6 | 0.4
Purchases, sales and settlements, net | (0.7) | (0.5)
Balance at the end of the period | 10.9 | 10.5
Fair Value Measurements Recurring | Significant Unobservable Inputs (Level 3) | Real estate partnerships interests |  |
Changes in plan assets: |  |
Balance at the beginning of the period | 10.3 | 9.3
Actual return (loss) on plan assets: |  |
Assets held at the reporting date | 0.6 | 1.1
Assets sold during the period | 0.5 | 0.4
Purchases, sales and settlements, net | (0.6) | (0.5)
Balance at the end of the period | $ 10.8 | $ 10.3

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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + 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)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + 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)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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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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- Definition Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations. + 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)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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