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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | $ 5.3 | $ 4.2 | $ 10.6 | $ 8.3
Interest cost | 14.9 | 8.6 | 23.1 | 17.3
Expected return on plan assets | (36.7) | (13.7) | (55.2) | (27.3)
Prior service cost (credits) | 0.3 | 0.3 | 0.5 | 0.6
Net actuarial loss | 6.6 | 5.9 | 13.3 | 11.8
Net periodic benefit cost (credit) | (9.6) | 5.3 | (7.7) | 10.7
Defined Benefit Pension Contributions | 0.2 | 3.5 | 4.0 | 6.7
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | 1.4 | 0.4 | 1.9 | 0.8
Interest cost | 4.3 | 2.4 | 6.5 | 4.7
Expected return on plan assets | (4.6) | (4.2) | (9.1) | (8.4)
Prior service cost (credits) | (0.5) | (0.5) | (1.0) | (1.0)
Net actuarial loss | 0.7 | 1.2 | 1.4 | 2.5
Net periodic benefit cost (credit) | 1.3 | (0.7) | (0.3) | (1.4)
OPEB Contributions | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: 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=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: 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=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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