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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Amortization of net loss (gain) | $ (25.0) | $ 9.4 | $ (2.7)
Amortization of prior service credit | $ 4.6 | $ 4.7 | 4.5
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Discount rate used to determine obligation (as a percent) | 2.40% | 1.80% |
Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Service cost | $ 4.8 | $ 5.1 | 4.7
Interest cost | 6.4 | 7.9 | 9.3
Expected return on plan assets | (14.7) | (14.0) | (11.9)
Amortization of net loss (gain) | 5.2 | 4.5 | 5.2
Amortization of prior service credit | (2.3) | (2.3) | (2.3)
Net periodic benefit cost (benefit) | (0.6) | 1.2 | 5.0
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) | (20.4) | 11.4 | (1.7)
Amortization of net loss (gain) | (3.9) | (3.4) | (3.9)
Amortization of prior service credit | 1.7 | 1.7 | 1.7
Total recognized in other comprehensive (income) loss | (22.6) | 9.7 | (3.9)
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ (23.2) | $ 10.9 | $ 1.1
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 2.90% | 2.50% | 3.40%
Expected return plan assets (as a percent) | 7.00% | 7.25% | 7.50%
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 | $ 249.5 | $ 263.1 | $ 239.9
Pension Benefits | Minimum |  |  |
Weighted Average Assumptions: |  |  |
Cash balance interest credit rate | 1.50% | 0.75% | 1.75%
Pension Benefits | Maximum |  |  |
Weighted Average Assumptions: |  |  |
Cash balance interest credit rate | 3.25% | 3.25% | 3.75%
Post-retirement benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Service cost | $ 0.7 | $ 0.5 | $ 0.4
Interest cost | 0.7 | 0.8 | 0.9
Amortization of net loss (gain) | 1.0 | 0.5 | (0.1)
Amortization of prior service credit | (3.7) | (3.7) | (3.8)
Net periodic benefit cost (benefit) | (1.3) | (1.9) | (2.6)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |  |
Net loss (gain) |  | 2.0 | 2.5
Amortization of net loss (gain) | (0.7) | (0.3) | 0.2
Amortization of prior service credit | 2.8 | 2.8 | 2.8
Total recognized in other comprehensive (income) loss | 2.1 | 4.5 | 5.5
Total recognized in net periodic benefit cost and other comprehensive (income) loss | $ 0.8 | $ 2.6 | $ 2.9
Weighted Average Assumptions: |  |  |
Discount rate (as a percent) | 3.00% | 2.70% | 3.50%
Rate of compensation increase (as a percent) | 3.00% | 3.00% | 3.00%
Immediate health care cost trend rate, Pre-65 group (as a percent) | 5.70% | 5.30% | 5.70%
Immediate health care cost trend rate, Post-65 group (as a percent) | 5.80% | 5.40% | 5.90%
Ultimate health care cost trend rate (as a percent) | 4.00% | 4.40% | 4.40%
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Total obligation | $ 29.3 | $ 29.1 | $ 26.0
Qualified Plan | Pension Benefits |  |  |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Total obligation | 247.8 | 261.4 |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (39.9) | (64.2) |
Amount recognized as prior service credit, net of tax | 0.8 | 2.5 |
Total | (39.1) | (61.7) |
Qualified Plan | Post-retirement benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Current liabilities | 0.9 | 1.0 |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (3.7) | (4.4) |
Amount recognized as prior service credit, net of tax | 13.9 | 16.6 |
Total | 10.2 | 12.2 |
Nonqualified Plan | Pension Benefits |  |  |
Components of Net Periodic Benefit Cost (Benefit): |  |  |
Current liabilities | 1.8 | 1.7 |
Qualified Pension Plans, Non-qualified Pension Plans and Post-retirement Plans |  |  |
Amounts recognized in accumulated other comprehensive income for net loss, net of tax | (0.7) | (0.8) |
Amount recognized as prior service credit, net of tax |  | 0.1 |
Total | $ (0.7) | $ (0.7) |

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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 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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