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RETIREMENT PLANS (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
United States | Pension |  |  |  |  |  |
Net periodic benefit costs |  |  |  |  |  |
Service cost |  |  |  | $ 68.4 | $ 72.8 | $ 74.5
Interest cost on benefit obligation |  |  |  | 70.3 | 89.0 | 83.1
Expected return on plan assets |  |  |  | (152.9) | (149.5) | (161.9)
Recognition of net actuarial loss (gain) |  |  |  | 51.9 | 23.6 | 39.0
Amortization of prior service cost (benefit) |  |  |  | (7.4) | (11.5) | (6.8)
Curtailments and settlements |  |  |  | 2.5 | 9.1 |
Total expense (benefit) |  |  |  | $ 32.8 | $ 33.5 | $ 27.9
Other Pension Plan Information |  |  |  |  |  |
Contributions to plan | $ 120.0 |  |  |  |  |
Plan amendments, decrease in benefit obligation |  | $ 40.4 |  |  |  |
Discount rate (as a percent) |  | 4.34% |  | 2.48% | 3.20% | 4.34%
United States | Postretirement Health Care |  |  |  |  |  |
Net periodic benefit costs |  |  |  |  |  |
Service cost |  |  |  | $ 1.2 | $ 1.4 | $ 2.7
Interest cost on benefit obligation |  |  |  | 4.4 | 5.6 | 5.6
Expected return on plan assets |  |  |  | (0.4) | (0.4) | (0.4)
Recognition of net actuarial loss (gain) |  |  |  | 0.1 | (4.1) | (1.9)
Amortization of prior service cost (benefit) |  |  |  | (11.0) | (23.2) | (19.7)
Curtailments and settlements |  |  |  |  | 0.3 |
Total expense (benefit) |  |  |  | $ (5.7) | $ (20.4) | $ (13.7)
Other Pension Plan Information |  |  |  |  |  |
Plan amendments, decrease in benefit obligation |  |  | $ 18.9 |  |  |
Discount rate (as a percent) |  | 4.29% | 4.36% | 2.37% | 3.16% | 4.29%
Decrease in defined benefit cost due to re-measurement of benefit plans |  |  |  |  |  | $ (4.5)
International | Pension |  |  |  |  |  |
Net periodic benefit costs |  |  |  |  |  |
Service cost |  |  |  | $ 30.8 | $ 30.2 | 33.2
Interest cost on benefit obligation |  |  |  | 22.3 | 31.2 | 29.1
Expected return on plan assets |  |  |  | (63.9) | (59.9) | (63.2)
Recognition of net actuarial loss (gain) |  |  |  | 26.1 | 16.3 | 17.2
Amortization of prior service cost (benefit) |  |  |  | (0.1) | (0.9) | (0.9)
Curtailments and settlements |  |  |  | 2.2 | (1.9) | 2.3
Total expense (benefit) |  |  |  | 17.4 | 15.0 | $ 17.7
Other Pension Plan Information |  |  |  |  |  |
Plan amendments, decrease in benefit obligation |  |  |  | $ 1.7 | $ (0.1) |
Discount rate (as a percent) |  | 2.49% |  | 1.13% | 1.52% | 2.49%
Discontinued Operations |  |  |  |  |  |
Net periodic benefit costs |  |  |  |  |  |
Service cost |  |  |  | $ 2.5 | $ 7.8 | $ 7.1

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