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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Total recognized in other comprehensive (income) loss | $ 2.5 | $ (23.8) | $ (20.4)
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Discount rate used to determine obligation (as a percent) | 5.20% | 5.50% |
Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Service cost | $ 3.1 | $ 4.8 | 4.8
Interest cost | 10.0 | 7.0 | 6.4
Expected return on plan assets | (13.9) | (16.0) | (14.7)
Amortization of net loss (gain) | 1.3 | 2.4 | 5.2
Amortization of prior service credit |  | (1.0) | (2.3)
Net periodic benefit cost (credit) | 0.5 | (2.8) | (0.6)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) | (4.5) | (12.3) | (20.4)
Amortization of net loss (gain) | (1.0) | (1.8) | (3.9)
Amortization of prior service credit |  | 0.8 | 1.7
Total recognized in other comprehensive (income) loss | (5.5) | (13.3) | (22.6)
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ (5.0) | $ (16.1) | $ (23.2)
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 5.30% | 5.60% | 2.90%
Expected return plan assets (as a percent) | 6.85% | 6.75% | 7.00%
Rate of compensation increase (as a percent) | 3.50% |  | 3.00%
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Benefit obligation at end of year | $ 193.1 | $ 187.4 | $ 249.5
Pension Benefits | Minimum |  |  |
Weighted Average Assumptions: |  |  |
Rate of compensation increase (as a percent) |  | 3.50% |
Cash balance interest credit rate | 3.25% | 3.25% | 1.50%
Pension Benefits | Maximum |  |  |
Weighted Average Assumptions: |  |  |
Rate of compensation increase (as a percent) |  | 4.00% |
Cash balance interest credit rate | 4.50% | 3.50% | 3.25%
Post-retirement benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Service cost | $ 0.2 | $ 0.7 | $ 0.7
Interest cost | 0.8 | 0.8 | 0.7
Amortization of net loss (gain) | (2.0) | 0.8 | 1.0
Amortization of prior service credit | (3.7) | (3.6) | (3.7)
Net periodic benefit cost (credit) | (4.7) | (1.3) | (1.3)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) | 3.4 | (10.7) |
Amortization of net loss (gain) | 1.5 | (0.6) | (0.7)
Amortization of prior service credit | 2.8 | 2.7 | 2.8
Total recognized in other comprehensive (income) loss | 7.7 | (8.6) | 2.1
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ 3.0 | $ (9.9) | $ 0.8
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 5.40% | 5.50% | 3.00%
Rate of compensation increase (as a percent) | 3.50% |  | 3.00%
Immediate health care cost trend rate, Pre-65 group (as a percent) | 6.80% | 6.60% | 5.70%
Immediate health care cost trend rate, Post-65 group (as a percent) | 7.10% | 6.10% | 5.80%
Ultimate health care cost trend rate (as a percent) | 3.90% | 4.00% | 4.00%
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Benefit obligation at end of year | $ 19.5 | $ 15.3 | $ 29.3
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 | (20.3) | $ (25.8) |
Total | (20.3) | (25.8) |
Qualified Plan | Post-retirement benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Current liabilities | 1.1 | 0.9 |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | 2.7 | 7.6 |
Amount recognized as prior service credit, net of tax | 8.3 | 11.1 |
Total | 11.0 | 18.7 |
Nonqualified Plan | Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Credit): |  |  |
Current liabilities | 1.2 | 0.7 |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (0.2) | 0.1 |
Total | $ (0.2) | $ 0.1 |

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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 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 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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