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EMPLOYEE BENEFIT PLANS - Schedule of Change in Benefit Obligation, Change in Plan Assets and Components of Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation - beginning of year | $ 433.8 | $ 549.3 |
Service cost | 3.1 | 4.1 | $ 4.7
Interest cost | 19.6 | 14.1 | 14.2
Actuarial loss / (gain) | 9.2 | (80.8) |
Benefits paid | (44.8) | (47.1) |
Other | 2.9 | (5.8) |
Projected benefit obligation - end of year | 423.8 | 433.8 | 549.3
Projected salary increases | (6.5) | (6.3) |
Accumulated benefit obligation | 417.3 | 427.5 |
Change in plan assets: |  |  |
Plan assets - beginning of year | 396.6 | 529.3 |
Actual return on plan assets | 37.7 | (89.9) |
Company contributions | 9.1 | 6.3 |
Benefits paid | (44.8) | (47.0) |
Other | 1.9 | (2.1) |
Plan assets - end of year | 400.5 | 396.6 | 529.3
Unfunded status at end of year | (23.3) | (37.2) |
Health Care Benefits |  |  |
Change in benefit obligation: |  |  |
Projected benefit obligation - beginning of year | 5.9 | 15.8 |
Service cost | 0.0 | 0.0 | 0.1
Interest cost | 0.3 | 0.4 | 0.5
Actuarial loss / (gain) | (1.0) | (2.9) |
Benefits paid | (0.9) | (1.0) |
Other | 0.1 | (6.5) |
Projected benefit obligation - end of year | 4.4 | 5.9 | 15.8
Projected salary increases | 0.0 | 0.0 |
Accumulated benefit obligation | 4.4 | 5.9 |
Change in plan assets: |  |  |
Plan assets - beginning of year | 0.0 | 0.0 |
Actual return on plan assets | 0.0 | 0.0 |
Company contributions | 0.9 | 1.0 |
Benefits paid | (0.9) | (1.0) |
Other | 0.0 | 0.0 |
Plan assets - end of year | 0.0 | 0.0 | $ 0.0
Unfunded status at end of year | $ (4.4) | $ (5.9) |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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