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BENEFIT PLANS: - Other (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) plan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Benefit plans |  |  |
Number of noncontributory defined benefit pension plans | plan | 2 |  |
Post retirement defined benefit plans and defined contribution plan |  |  |
Defined benefit plan, net periodic benefit costs |  |  |
Service cost | $ 2.3 | $ 1.8 | $ 1.4
Interest cost | 3.6 | 2.3 | 1.5
Expected return on plan assets | (5.9) | (3.9) | (3.3)
Amortization of net actuarial loss | 0.1 | 0.1 | (0.1)
Amortization of prior service cost / (credit) | 0.7 | 0.2 | 0.2
Amortization of net loss/(gain) | 0.3 | 0.3 | 0.3
Net periodic benefit cost | 1.1 | 0.8 |
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 38.6 | 36.3 |
Service cost | 2.3 | 1.8 | 1.4
Interest cost | 3.6 | 2.3 | 1.5
Benefits paid | (3.9) | (2.8) |
Actuarial loss | 1.8 | 1.0 |
Actuarial loss (gain) assumption changes | 0.6 | (1.7) |
Inflation adjustment | 4.4 | 1.7 |
Projected benefit obligation at end of year | 47.4 | 38.6 | 36.3
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 59.2 | 56.0 |
Actual return on plan assets | 8.8 | 1.9 |
Employer contributions | (1.0) | (0.8) |
Benefits paid | (0.9) | (0.8) |
Currency exchange rate adjustment | 7.1 | 2.9 |
Fair value of plan assets at end of year | 73.2 | 59.2 | 56.0
Funded status at end of year | 25.8 | 20.6 |
Amounts recognized in statement of financial position |  |  |
Non-current assets | 25.8 | 20.6 |
Total | 25.8 | 20.6 |
Amounts recognized in accumulated other comprehensive income |  |  |
Net loss (gain) | 6.2 | 6.7 |
Prior service cost | 1.1 | 1.1 |
Total, net of tax | 7.3 | 7.8 | 7.2
Net loss (gain), income taxes | (4.7) | (4.8) |
Reconciliation of accumulated other comprehensive income: |  |  |
Accumulated other comprehensive income at beginning of plan year | 7.8 | 7.2 |
Net (gain) loss ocurring during the year | (0.6) | 0.8 |
Net (gain) amortized during the year | (0.4) | (0.4) |
Prior service cost (credit) | 0.3 |  |
Settlement | (0.4) |  |
Currency exchange rate adjustment | 0.6 | 0.2 |
Net adjustment to accumulated other comprehensive income | (0.5) | 0.6 |
Accumulated other comprehensive income at end of plan year | 7.3 | 7.8 | $ 7.2
Net adjustment to accumulated other comprehensive income, income taxes | 0.1 | (0.5) |
Amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax |  |  |
Net loss / (gain) | (0.6) | 0.8 |
Amortization of net (loss) gain | (0.4) | (0.4) |
Amortization of prior services cost (credit) | 0.3 |  |
Total amortization expenses | (0.7) | $ 0.4 |
Expected Benefit Payments |  |  |
2024 | 9.3 |  |
2025 | 4.0 |  |
2026 | 4.2 |  |
2027 | 4.9 |  |
2028 | 4.7 |  |
2029 to 2033 | 25.5 |  |
Total | $ 52.6 |  |
Post retirement defined benefit plans and defined contribution plan | Expatriate Plan |  |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |  |
Discount rate (as a percent) | 4.65% | 4.85% | 2.40%
Expected long-term rate of return on plan asset (as a percent) | 4.50% | 4.00% | 3.00%
Post retirement defined benefit plans and defined contribution plan | Mexican Health Plan |  |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |  |
Discount rate (as a percent) | 9.98% | 10.09% | 8.02%
Expected long-term rate of return on plan asset (as a percent) | 9.98% | 10.09% | 8.02%
Rate of increase in future compensation level (as a percent) | 5.00% | 4.75% | 4.50%
Post-retirement Health care plans |  |  |
Defined benefit plan, net periodic benefit costs |  |  |
Interest cost | $ 2.2 | $ 1.7 | $ 1.6
Amortization of net loss/(gain) |  | 0.1 | 0.2
Net periodic benefit cost | 2.2 | 1.8 | 1.8
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 20.3 | 21.4 |
Interest cost | 2.2 | 1.7 | 1.6
Benefits paid | (1.1) | (1.6) |
Actuarial loss | (1.6) | (2.6) |
Inflation adjustment | 2.9 | 1.4 |
Projected benefit obligation at end of year | 22.7 | 20.3 | 21.4
Change in plan assets: |  |  |
Funded status at end of year | 22.7 | 20.3 |
Amounts recognized in statement of financial position |  |  |
Non-current liabilities | (22.7) | (20.3) |
Total | (22.7) | (20.3) |
Amounts recognized in accumulated other comprehensive income |  |  |
Net loss (gain) | 0.9 | 1.6 |
Total, net of tax | 0.9 | 1.6 | 3.3
Net loss (gain), income taxes | (0.4) | (0.5) |
Reconciliation of accumulated other comprehensive income: |  |  |
Accumulated other comprehensive income at beginning of plan year | 1.6 | 3.3 |
Net (gain) loss ocurring during the year | (0.8) | (1.8) |
Net (gain) amortized during the year |  | (0.1) |
Currency exchange rate adjustment | 0.2 | 0.2 |
Net adjustment to accumulated other comprehensive income | (0.7) | (1.7) |
Accumulated other comprehensive income at end of plan year | 0.9 | 1.6 | $ 3.3
Net adjustment to accumulated other comprehensive income, income taxes | (0.4) | (0.5) |
Amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax |  |  |
Net loss / (gain) | (0.8) | (1.8) |
Amortization of net (loss) gain |  | (0.1) |
Total amortization expenses | (0.8) | $ (1.9) |
Expected Benefit Payments |  |  |
2024 | 1.7 |  |
2025 | 1.8 |  |
2026 | 1.8 |  |
2027 | 1.9 |  |
2028 | 2.0 |  |
2029 to 2033 | 10.6 |  |
Total | $ 19.8 |  |
Post-retirement Health care plans | Expatriate Plan |  |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |  |
Discount rate (as a percent) | 4.65% | 4.85% | 2.40%
Post-retirement Health care plans | Mexican Health Plan |  |  |
Expected Benefit Payments |  |  |
Assumed trend rate for covered health care benefit cost (as a percent) | 5.00% |  |
Effect of one percentage-point change in assumed other benefit cost trend rates |  |  |
Effect of one percentage-point increase on total service and interest cost components | $ 2.4 |  |
Effect of one percentage-point decrease on total service and interest cost components | 1.9 |  |
Effect of one percentage-point increase on post-retirement benefit obligation | 23.4 |  |
Effect of one percentage-point decrease on post-retirement benefit obligation | $ 21.3 |  |
Post-retirement Health care plans | Weighted average | Mexican Health Plan |  |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |  |
Discount rate (as a percent) | 9.98% | 10.09% | 8.02%

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- Definition The adjustment out of accumulated other comprehensive income after tax for amortized gains or losses recognized as a component of net periodic benefit cost during the period. + References No definition available. + Details
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- Definition The adjustment out of accumulated other comprehensive income after tax for amortization of prior services cost (credit) recognized as a component of net periodic benefit cost during the period. + References No definition available. + Details
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- Definition The increase (decrease) in accumulated other comprehensive income during the period related to pension and other postretirement benefit plans, after tax. + References No definition available. + Details
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- Definition Amount of tax (expense) benefit on increase (decrease) in accumulated other comprehensive income during the period, related to pension and other postretirement benefit plans. + References No definition available. + Details
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- Definition The accumulated change in the value of either the projected benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost, net of tax. + References No definition available. + Details
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- Definition The adjustment out of accumulated other comprehensive income after tax for amortized gains or losses recognized as a component of net periodic benefit cost during the period. + References No definition available. + Details
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- Definition Amount after tax, of accumulated other comprehensive income (loss) for prior service cost (credit) of defined benefit plan. + References No definition available. + Details
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- Definition Amount after tax, of accumulated other comprehensive income (loss) for settlement of defined benefit plan. + References No definition available. + Details
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- Definition The adjustment out of other comprehensive income for the net changes in currency rate changes recognized as a component of net periodic benefit cost during the period, after tax. + References No definition available. + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations. + References No definition available. + Details
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- Definition The amount of gains and losses, net of tax that are not yet recognized as a component of the net periodic benefit cost and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from the experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References No definition available. + Details
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- Definition Aggregate amount of tax portion on gains (losses), that are not yet recognized as a component of the net periodic benefit cost and that are recognized as increases (decreases) in other comprehensive income as they arise. Gains (losses) are due to changes in the value of either the benefit obligation or the plan assets resulting from the experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References No definition available. + Details
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- Definition Represents the interest rate used to adjust for the time value of money assumed to determine the pension obligation and seniority premiums as of the year-end and the net cost. + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to determine the pension obligation and seniority premiums as of year-end and the net cost. + References No definition available. + Details
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- Definition Represents the expected rate of compensation increases (for pay-related plans) assumed to determine the pension obligation and seniority premiums as of the year-end and the net cost. + References No definition available. + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid between fifth fiscal year and eight fiscal year. + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the current year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan, population by age and dependency status. + References No definition available. + Details
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- Definition Represents the number of expatriate noncontributory defined benefit pension plans. + References No definition available. + Details
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- Definition This element represents the amount of net gains and losses amounts in accumulative other comprehensive income recognized as a component of net periodic benefit cost during the period, after tax. + References No definition available. + Details
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- Definition Represents the change in the net periodic benefit cost attributable to inflationary adjustments. + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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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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- 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 -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)(5) -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)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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