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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension Benefits |  |  |  |
Components of net periodic benefit cost (credit): |  |  |  |
Service cost | $ 1.3 | $ 1.1 | $ 3.5 | $ 2.8
Interest cost | 2.6 | 2.4 | 7.8 | 7.3
Expected return on plan assets | (4.4) | (3.8) | (13.2) | (11.4)
Amortization of net actuarial loss (gain) |  | 0.1 |  | 0.3
Net periodic benefit credit | (0.5) | (0.2) | (1.9) | (1.0)
Post-retirement benefits |  |  |  |
Components of net periodic benefit cost (credit): |  |  |  |
Service cost |  |  | 0.1 | 0.2
Interest cost | 0.3 | 0.3 | 0.8 | 0.8
Amortization of net actuarial loss (gain) | (0.2) | (0.2) | (0.5) | (0.6)
Amortization of prior service credit | (2.7) | (1.0) | (4.6) | (2.8)
Net periodic benefit credit | $ (2.6) | $ (0.9) | $ (4.2) | $ (2.4)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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