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RETIREMENT PLANS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other (income) expense |  |  |
Other Pension Plan Information |  |  |
Settlement expense before tax |  | $ 51.6 | $ 35.3
Settlement expense after tax |  | 38.9 | 26.8
U.S. Pension. | Pension |  |  |
Net periodic benefit costs |  |  |
Service cost | $ 40.9 | 40.8 |
Interest cost on benefit obligation | 88.1 | 65.3 |
Expected return on plan assets | (145.1) |  |
Recognition of net actuarial loss (gain) | 0.2 |  |
Amortization of prior service benefit | (4.5) |  |
Total expense | (20.4) |  |
U.S. Pension. | U.S. Postretirement Benefits |  |  |
Net periodic benefit costs |  |  |
Service cost | 0.4 | 0.8 | 31.4
Interest cost on benefit obligation | 5.6 | 3.3 | 17.3
Expected return on plan assets |  |  | (70.7)
Recognition of net actuarial loss (gain) |  |  | 28.7
Amortization of prior service benefit |  |  | (0.1)
Curtailments and settlements |  |  | 3.5
Total expense |  |  | $ 10.1
International Pension | Pension |  |  |
Net periodic benefit costs |  |  |
Service cost | 21.7 | 28.4 |
Interest cost on benefit obligation | $ 45.9 | $ 22.0 |

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