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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Current liabilities | $ 3.1 | $ 3.0 |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
New prior service cost (credit) |  |  | $ (0.8)
Amortization of net loss | (2.7) | (1.1) | (1.7)
Amortization of prior service cost | $ 4.5 | $ 4.7 | 4.0
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Discount rate used to determine obligation (as a percent) | 2.80% | 4.00% |
Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Service cost | $ 4.7 | $ 4.4 | 4.0
Interest cost | 9.3 | 8.6 | 9.7
Expected return on plan assets | (11.9) | (13.5) | (13.5)
Amortization of net loss | 5.2 | 4.6 | 5.1
Amortization of prior service credit | (2.3) | (2.3) | (2.3)
Net periodic benefit cost (benefit) | 5.0 | 1.8 | 3.0
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) | (1.7) | 7.8 | 0.8
Amortization of net loss | (3.9) | (3.5) | (3.1)
Amortization of prior service cost | 1.7 | 1.7 | 1.4
Total recognized in other comprehensive (income) loss | (3.9) | 6.0 | (0.9)
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ 1.1 | $ 7.8 | $ 2.1
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 3.40% | 4.40% | 3.80%
Expected return plan assets (as a percent) | 7.50% | 7.50% | 7.75%
Rate of compensation increase (as a percent) | 3.00% | 3.00% | 3.00%
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Total obligation | $ 239.9 | $ 217.4 | $ 232.1
Post-retirement Benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Service cost | 0.4 | 0.6 | 0.5
Interest cost | 0.9 | 1.0 | 1.1
Amortization of net loss | (0.1) | 1.5 | 1.2
Amortization of prior service credit | (3.8) | (3.8) | (3.8)
Net periodic benefit cost (benefit) | (2.6) | (0.7) | (1.0)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) | 2.5 | (4.7) | 1.1
Amortization of net loss | 0.2 | (1.1) | (0.7)
Amortization of prior service cost | 2.8 | 2.8 | 2.3
Total recognized in other comprehensive (income) loss | 5.5 | (3.0) | 2.7
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ 2.9 | $ (3.7) | $ 1.7
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 3.50% | 4.50% | 3.90%
Rate of compensation increase (as a percent) | 3.00% | 3.00% | 3.00%
Initial health care cost trend rate, Pre-65 group (as a percent) | 5.70% | 6.00% | 6.30%
Initial health care cost trend rate, Post-65 group (as a percent) | 5.90% | 6.30% | 6.80%
Ultimate health care cost trend rate (as a percent) | 4.40% | 4.40% | 4.40%
Effect of one percentage point change in the assumed health care cost trend rates |  |  |
Effect of one percentage point increase on total of service and interest cost components | $ 0.2 | $ 0.3 | $ 0.3
Effect of one percentage point increase on post-retirement benefit obligation | 3.3 | 2.6 | 4.0
Effect of one percentage point decrease on total of service and interest cost components | (0.2) | (0.2) | (0.2)
Effect of one percentage point decrease on post-retirement benefit obligation | (2.6) | (2.0) | (3.0)
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Total obligation | 26.0 | 22.2 | $ 27.7
Estimated net loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2020 | 2.3 |  |
Qualified Plan | Pension Benefits |  |  |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Total obligation | 238.3 | 215.9 |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (56.2) | (61.8) |
Amount recognized as prior service credit, net of tax | 4.3 | 6.0 |
Total | (51.9) | (55.8) |
Estimated net loss and prior service credit that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2020 | 1.5 |  |
Qualified Plan | Post-retirement Benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Current liabilities | 1.0 | 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 | (2.8) | (0.1) |
Amount recognized as prior service credit, net of tax | 19.1 | 21.8 |
Total | 16.3 | 21.7 |
Nonqualified Plan | Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Current liabilities | 2.1 | 1.8 |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (0.6) | (0.4) |
Amount recognized as prior service credit, net of tax | 0.2 | 0.3 |
Total | $ (0.4) | $ (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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