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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Components of net periodic benefit cost |  |  |  |
Contributions and payments related to pension and OPEB plans |  |  | $ 12.1 | $ 13.8
Pension Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 11.6 | $ 11.9 | 34.7 | 35.7
Interest cost | 30.3 | 28.5 | 91.1 | 85.5
Expected return on plan assets | (48.3) | (49.2) | (145.2) | (147.6)
Loss on plan settlement | 7.8 | 0.4 | 9.6 | 1.1
Amortization of prior service (credit) cost | 0.5 | 0.7 | 1.6 | 2.0
Amortization of net actuarial (gain) loss | 18.9 | 23.6 | 56.6 | 70.6
Net periodic benefit (credit) cost | 20.8 | 15.9 | 48.4 | 47.3
Contributions and payments related to pension and OPEB plans |  |  | 9.6 |
Estimated future employer contributions for the remainder of the year | 52.2 |  | 52.2 |
Other Postretirement Benefit Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | 4.1 | 5.9 | 12.3 | 17.7
Interest cost | 6.5 | 7.5 | 19.3 | 22.4
Expected return on plan assets | (13.7) | (14.9) | (41.0) | (44.6)
Amortization of prior service (credit) cost | (3.9) | (3.8) | (11.6) | (11.5)
Amortization of net actuarial (gain) loss | (2.0) | 0.3 | (4.7) | 0.8
Net periodic benefit (credit) cost | (9.0) | $ (5.0) | (25.7) | $ (15.2)
Contributions and payments related to pension and OPEB plans |  |  | 2.5 |
Estimated future employer contributions for the remainder of the year | $ 4.1 |  | $ 4.1 |

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