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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Total recognized in other comprehensive (income) loss | $ (3.2) | $ 2.5 | $ (23.8)
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Discount rate used to determine obligation (as a percent) | 5.40% | 5.20% |
Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Service cost | $ 3.7 | $ 3.1 | 4.8
Interest cost | 9.7 | 10.0 | 7.0
Expected return on plan assets | (15.1) | (13.9) | (16.0)
Amortization of net actuarial loss (gain) | 0.4 | 1.3 | 2.4
Amortization of prior service credit |  |  | (1.0)
Net periodic benefit cost (credit) | (1.3) | 0.5 | (2.8)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) | (6.0) | (4.5) | (12.3)
Amortization of net actuarial (loss) gain | (0.3) | (1.0) | (1.8)
Amortization of prior service credit |  |  | 0.8
Total recognized in other comprehensive (income) loss | (6.3) | (5.5) | (13.3)
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ (7.6) | $ (5.0) | $ (16.1)
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 5.60% | 5.30% | 5.60%
Expected return on plan assets (as a percent) | 6.85% | 6.85% | 6.75%
Rate of compensation increase (as a percent) | 3.50% | 3.50% |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Benefit obligation at end of year | $ 192.2 | $ 193.1 | $ 187.4
Pension Benefits | Minimum |  |  |
Weighted Average Assumptions: |  |  |
Rate of compensation increase (as a percent) |  |  | 3.50%
Cash balance interest credit rate | 3.90% | 3.25% | 3.25%
Pension Benefits | Maximum |  |  |
Weighted Average Assumptions: |  |  |
Rate of compensation increase (as a percent) |  |  | 4.00%
Cash balance interest credit rate | 4.42% | 4.50% | 3.50%
Post-retirement benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Service cost | $ 0.2 | $ 0.2 | $ 0.7
Interest cost | 1.0 | 0.8 | 0.8
Amortization of net actuarial loss (gain) | (0.8) | (2.0) | 0.8
Amortization of prior service credit | (3.7) | (3.7) | (3.6)
Net periodic benefit cost (credit) | (3.3) | (4.7) | (1.3)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) | (0.5) | 3.4 | (10.7)
Amortization of net actuarial (loss) gain | 0.6 | 1.5 | (0.6)
Amortization of prior service credit | 2.8 | 2.8 | 2.7
Total recognized in other comprehensive (income) loss | 2.9 | 7.7 | (8.6)
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ (0.4) | $ 3.0 | $ (9.9)
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 5.60% | 5.40% | 5.50%
Rate of compensation increase (as a percent) | 3.50% | 3.50% |
Immediate health care cost trend rate, Pre-65 group (as a percent) | 6.30% | 6.80% | 6.60%
Immediate health care cost trend rate, Post-65 group (as a percent) | 6.50% | 7.10% | 6.10%
Ultimate health care cost trend rate (as a percent) | 3.90% | 3.90% | 4.00%
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Benefit obligation at end of year | $ 18.4 | $ 19.5 | $ 15.3
Post-retirement benefits | Minimum |  |  |
Weighted Average Assumptions: |  |  |
Rate of compensation increase (as a percent) |  |  | 3.50%
Post-retirement benefits | Maximum |  |  |
Weighted Average Assumptions: |  |  |
Rate of compensation increase (as a percent) |  |  | 4.00%
Qualified Plan | Pension Benefits |  |  |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (14.0) | (20.3) |
Total | (14.0) | (20.3) |
Qualified Plan | Post-retirement benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Current liabilities | 1.1 | 1.1 |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | 2.5 | 2.7 |
Amount recognized as prior service credit, net of tax | 5.6 | 8.3 |
Total | 8.1 | 11.0 |
Nonqualified Plan | Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Current liabilities | 0.4 | 1.2 |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (0.4) | (0.2) |
Total | $ (0.4) | $ (0.2) |

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- Definition The assumed post-medicare health care cost trend rate for the next 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 The assumed pre-medicare health care cost trend rate for the next 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 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 (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: 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 gain (loss) 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, 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 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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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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