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EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Costs (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0.3 | $ 0.3 | $ 0.3
Interest cost | 1.1 | 1.5 | 1.3
Expected return on plan assets | (1.7) | (1.7) | (1.8)
Amortization of initial net obligation and prior service cost | 0.0 | 0.0 | 0.0
Amortization of net loss | 1.0 | 0.8 | 1.0
Settlement and curtailment losses recognized | 0.0 | 0.0 | 0.0
Net periodic benefit cost | 0.7 | 0.9 | 0.8
Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 3.4 | 2.7 | 2.6
Interest cost | 5.4 | 7.0 | 7.0
Expected return on plan assets | (11.5) | (11.8) | (13.5)
Amortization of initial net obligation and prior service cost | 0.1 | 0.1 | 0.0
Amortization of net loss | 3.2 | 2.5 | 2.1
Settlement and curtailment losses recognized | 0.1 | 0.0 | 3.1
Net periodic benefit cost | $ 0.7 | $ 0.5 | $ 1.3

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: 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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