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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Components of net periodic benefit cost |  |  |  |
Contributions and payments related to pension and OPEB plans |  |  | $ 8.3 | $ 9.7
Pension Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 11.8 | $ 11.8 | 23.1 | 23.8
Interest cost | 30.2 | 28.7 | 60.8 | 57.0
Expected return on plan assets | (48.2) | (48.8) | (96.9) | (98.4)
Loss on plan settlement | 1.0 | 0.3 | 1.8 | 0.7
Amortization of prior service (credit) cost | 0.5 | 0.6 | 1.1 | 1.3
Amortization of net actuarial (gain) loss | 18.7 | 23.9 | 37.7 | 47.0
Net periodic benefit (credit) cost | 14.0 | 16.5 | 27.6 | 31.4
Contributions and payments related to pension and OPEB plans |  |  | 6.9 |
Estimated future employer contributions for the remainder of the year | 4.9 |  | 4.9 |
Other Postretirement Benefit Costs |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | 3.8 | 5.6 | 8.2 | 11.8
Interest cost | 6.3 | 7.4 | 12.8 | 14.9
Expected return on plan assets | (13.6) | (14.8) | (27.3) | (29.7)
Amortization of prior service (credit) cost | (3.8) | (3.9) | (7.7) | (7.7)
Amortization of net actuarial (gain) loss | (2.0) | 0.2 | (2.7) | 0.5
Net periodic benefit (credit) cost | (9.3) | $ (5.5) | (16.7) | $ (10.2)
Contributions and payments related to pension and OPEB plans |  |  | 1.4 |
Estimated future employer contributions for the remainder of the year | $ 5.3 |  | $ 5.3 |

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