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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Components of net periodic benefit cost        
Contributions and payments related to pension and OPEB plans     $ 10.1 $ 12.1
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 12.5 $ 11.6 37.3 34.7
Interest cost 25.6 30.3 77.8 91.1
Expected return on plan assets (47.4) (48.3) (143.0) (145.2)
Loss on plan settlement 5.2 7.8 15.5 9.6
Amortization of prior service (credit) cost 0.4 0.5 1.2 1.6
Amortization of net actuarial (gain) loss 26.1 18.9 75.8 56.6
Net periodic benefit (credit) cost 22.4 20.8 64.6 48.4
Contributions and payments related to pension and OPEB plans     9.0  
Estimated future employer contributions for the remainder of the year 2.5   2.5  
Other Postretirement Benefits        
Components of net periodic benefit cost        
Service cost 3.8 4.1 11.4 12.3
Interest cost 4.7 6.5 14.0 19.3
Expected return on plan assets (15.0) (13.7) (45.2) (41.0)
Amortization of prior service (credit) cost (3.8) (3.9) (11.3) (11.6)
Amortization of net actuarial (gain) loss (5.6) (2.0) (16.8) (4.7)
Net periodic benefit (credit) cost $ (15.9) $ (9.0) (47.9) $ (25.7)
Contributions and payments related to pension and OPEB plans     $ 1.1