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RETIREMENT PLANS - Information Related to Pension and Postretirement Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amounts recognized in Consolidated Balance Sheet: |  |  |  |  |
Other assets |  |  | $ 33.0 | $ 31.1 |
Postretirement health care and pension benefits |  |  | (1,226.2) | (1,084.4) |
Amounts recognized in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Accumulated other comprehensive loss (income), net of tax |  |  | 935.2 | 823.8 |
Change in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Other comprehensive loss (income) |  |  | 78.1 | 251.6 | $ (18.0)
Aggregate projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets: |  |  |  |  |
Aggregate projected benefit obligation |  |  | 4,155.4 | 3,970.3 |
Accumulated benefit obligation |  |  | 4,098.6 | 3,877.4 |
Fair value of plan assets |  |  | 3,085.2 | 3,040.5 |
Discontinued Operations |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Accumulated Benefit Obligation, end of year |  |  |  | 1.1 |
Projected Benefit Obligation |  |  |  |  |
Projected benefit obligation, beginning of year |  |  | 5.3 |  |
Service cost |  |  | 2.5 | 7.8 | 7.1
Projected benefit obligation, end of year |  |  |  | 5.3 |
Plan Assets |  |  |  |  |
Fair value of plan assets, beginning of year |  |  | 0.6 |  |
Fair value of plan assets, end of year |  |  |  | 0.6 |
Amounts recognized in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Accumulated other comprehensive loss (income), net of tax |  |  |  | 2.9 |
Aggregate projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets: |  |  |  |  |
Fair value of plan assets |  |  |  | 0.6 |
Non-qualified plan |  |  |  |  |
Projected Benefit Obligation |  |  |  |  |
Projected benefit obligation, beginning of year |  |  | 127.0 |  |
Projected benefit obligation, end of year |  |  | 134.0 | 127.0 |
United States | Pension |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Accumulated Benefit Obligation, end of year |  |  | 2,728.4 | 2,535.9 |
Projected Benefit Obligation |  |  |  |  |
Projected benefit obligation, beginning of year |  |  | 2,562.5 | 2,241.0 |
Service cost |  |  | 68.4 | 72.8 | 74.5
Interest cost |  |  | 70.3 | 89.0 | 83.1
Curtailments and settlements |  |  | (0.6) | 3.4 |
Plan amendments | $ (40.4) |  |  |  |
Actuarial (gain) loss |  |  | 241.8 | 336.4 |
Benefits paid |  |  | (214.0) | (180.1) |
Projected benefit obligation, end of year | 2,241.0 |  | 2,728.4 | 2,562.5 | 2,241.0
Plan Assets |  |  |  |  |
Fair value of plan assets, beginning of year |  |  | 2,292.9 | 1,981.4 |
Actual returns on plan assets |  |  | 281.3 | 366.9 |
Company contributions |  |  | 13.3 | 129.0 |
Curtailments and settlements |  |  | (0.6) | (4.3) |
Benefits paid |  |  | (214.0) | (180.1) |
Fair value of plan assets, end of year | 1,981.4 |  | 2,372.9 | 2,292.9 | 1,981.4
Funded Status, end of year |  |  | (355.5) | (269.6) |
Amounts recognized in Consolidated Balance Sheet: |  |  |  |  |
Other current liabilities |  |  | (14.7) | (12.5) |
Postretirement health care and pension benefits |  |  | (340.8) | (257.1) |
Net liability |  |  | (355.5) | (269.6) |
Amounts recognized in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Unrecognized net actuarial loss (gain) |  |  | 691.3 | 632.4 |
Unrecognized net prior service costs (benefits) |  |  | (32.7) | (40.0) |
Tax (benefit) expense |  |  | (165.1) | (149.1) |
Accumulated other comprehensive loss (income), net of tax |  |  | 493.5 | 443.3 |
Change in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Amortization of net actuarial (gain) loss |  |  | (51.8) | (23.5) |
Amortization of prior service costs |  |  | 7.4 | 11.5 |
Current period net actuarial loss (gain) |  |  | 113.3 | 119.0 |
Curtailments and settlements |  |  | (2.7) | (1.5) |
Tax (benefit) expense |  |  | (16.0) | (25.7) |
Other comprehensive loss (income) |  |  | 50.2 | 79.8 |
Estimated amounts in accumulated other comprehensive loss expected to be reclassified to net period cost during 2021 |  |  |  |  |
Net actuarial loss (gain) |  |  | 64.8 |  |
Net prior service costs (benefits) |  |  | (6.9) |  |
Total |  |  | 57.9 |  |
United States | Postretirement Health Care |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Accumulated Benefit Obligation, end of year |  |  | 172.4 | 165.7 |
Projected Benefit Obligation |  |  |  |  |
Projected benefit obligation, beginning of year |  |  | 165.7 | 147.3 |
Service cost |  |  | 1.2 | 1.4 | 2.7
Interest cost |  |  | 4.4 | 5.6 | 5.6
Participant contributions |  |  | 3.8 | 3.4 |
Curtailments and settlements |  |  |  | 0.6 |
Plan amendments |  | $ (18.9) |  |  |
Actuarial (gain) loss |  |  | 12.2 | 22.2 |
Benefits paid |  |  | (14.9) | (14.8) |
Projected benefit obligation, end of year | 147.3 |  | 172.4 | 165.7 | 147.3
Plan Assets |  |  |  |  |
Fair value of plan assets, beginning of year |  |  | 6.1 | 6.0 |
Actual returns on plan assets |  |  | 0.8 | 1.1 |
Company contributions |  |  | 13.7 | 13.8 |
Benefits paid |  |  | (14.9) | (14.8) |
Fair value of plan assets, end of year | 6.0 |  | 5.7 | 6.1 | 6.0
Funded Status, end of year |  |  | (166.7) | (159.6) |
Amounts recognized in Consolidated Balance Sheet: |  |  |  |  |
Other current liabilities |  |  | (5.5) | (5.2) |
Postretirement health care and pension benefits |  |  | (161.2) | (154.4) |
Net liability |  |  | (166.7) | (159.6) |
Amounts recognized in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Unrecognized net actuarial loss (gain) |  |  | 1.3 | (10.5) |
Unrecognized net prior service costs (benefits) |  |  |  | (11.0) |
Tax (benefit) expense |  |  | (2.0) | 3.4 |
Accumulated other comprehensive loss (income), net of tax |  |  | (0.7) | (18.1) |
Change in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Amortization of net actuarial (gain) loss |  |  | (0.1) | 4.1 |
Amortization of prior service costs |  |  | 11.0 | 23.2 |
Current period net actuarial loss (gain) |  |  | 11.9 | 21.4 |
Curtailments and settlements |  |  |  | 0.2 |
Tax (benefit) expense |  |  | (5.4) | (11.7) |
Other comprehensive loss (income) |  |  | 17.4 | 37.2 |
Estimated amounts in accumulated other comprehensive loss expected to be reclassified to net period cost during 2021 |  |  |  |  |
Net actuarial loss (gain) |  |  | 0.7 |  |
Total |  |  | 0.7 |  |
International | Pension |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Accumulated Benefit Obligation, end of year |  |  | 1,759.8 | 1,585.5 |
Projected Benefit Obligation |  |  |  |  |
Projected benefit obligation, beginning of year |  |  | 1,667.6 | 1,436.7 |
Service cost |  |  | 30.8 | 30.2 | 33.2
Interest cost |  |  | 22.3 | 31.2 | 29.1
Participant contributions |  |  | 2.6 | 3.0 |
Curtailments and settlements |  |  | (34.3) | (18.6) |
Plan amendments |  |  | (1.7) | 0.1 |
Actuarial (gain) loss |  |  | 83.6 | 235.8 |
Other events |  |  | 0.3 | 0.6 |
Benefits paid |  |  | (39.6) | (37.6) |
Foreign currency translation |  |  | 102.6 | (13.8) |
Projected benefit obligation, end of year | 1,436.7 |  | 1,834.2 | 1,667.6 | 1,436.7
Plan Assets |  |  |  |  |
Fair value of plan assets, beginning of year |  |  | 1,027.1 | 925.6 |
Actual returns on plan assets |  |  | 87.7 | 110.5 |
Company contributions |  |  | 41.3 | 43.3 |
Participant contributions |  |  | 2.6 | 3.0 |
Curtailments and settlements |  |  | (25.7) | (17.6) |
Benefits paid |  |  | (39.6) | (37.6) |
Foreign currency translation |  |  | 54.6 | (0.1) |
Fair value of plan assets, end of year | $ 925.6 |  | 1,148.0 | 1,027.1 | $ 925.6
Funded Status, end of year |  |  | (686.2) | (640.5) |
Amounts recognized in Consolidated Balance Sheet: |  |  |  |  |
Other assets |  |  | 37.0 | 31.1 |
Other current liabilities |  |  | (24.0) | (23.6) |
Postretirement health care and pension benefits |  |  | (699.2) | (647.8) |
Net liability |  |  | (686.2) | (640.3) |
Amounts recognized in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Unrecognized net actuarial loss (gain) |  |  | 595.6 | 527.7 |
Unrecognized net prior service costs (benefits) |  |  | (1.2) | 0.6 |
Tax (benefit) expense |  |  | (151.9) | (129.6) |
Accumulated other comprehensive loss (income), net of tax |  |  | 442.5 | 398.7 |
Change in Accumulated Other Comprehensive Loss (Income): |  |  |  |  |
Amortization of net actuarial (gain) loss |  |  | (29.5) | (17.3) |
Amortization of prior service costs |  |  | (0.2) | 1.1 |
Current period net actuarial loss (gain) |  |  | 66.4 | 185.8 |
Current period prior service costs |  |  | (1.7) | 0.1 |
Curtailments and settlements |  |  | (2.2) | 1.8 |
Tax (benefit) expense |  |  | (22.3) | (36.9) |
Foreign currency translation |  |  | 33.3 | (5.2) |
Other comprehensive loss (income) |  |  | 43.8 | $ 129.4 |
Estimated amounts in accumulated other comprehensive loss expected to be reclassified to net period cost during 2021 |  |  |  |  |
Net actuarial loss (gain) |  |  | 28.5 |  |
Net prior service costs (benefits) |  |  | (0.2) |  |
Total |  |  | $ 28.3 |  |

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- Definition This element represents the change in the value of either the benefit obligation or the plan assets resulting from foreign currency translation that has not been recognized in the net periodic benefit cost. + References No definition available. + Details
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- Definition This element represents the change in the value of either the benefit obligation or the plan assets resulting from Settlement that has not been recognized in the net periodic benefit cost. + References No definition available. + Details
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- Definition Amount, before 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=118255775&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=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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