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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Components of net periodic benefit cost    
Contributions and payments related to pension and OPEB plans $ 3.7 $ 4.2
Pension Benefits    
Components of net periodic benefit cost    
Service cost 13.1 11.3
Interest cost 26.1 30.6
Expected return on plan assets (47.9) (48.7)
Loss on plan settlement 0.3 0.8
Amortization of prior service (credit) cost 0.4 0.6
Amortization of net actuarial (gain) loss 24.2 19.0
Net periodic benefit (credit) cost 16.2 13.6
Contributions and payments related to pension and OPEB plans 3.5  
Estimated future employer contributions for the remainder of the year 8.0  
Other Postretirement Benefits    
Components of net periodic benefit cost    
Service cost 4.1 4.4
Interest cost 4.7 6.5
Expected return on plan assets (15.1) (13.7)
Amortization of prior service (credit) cost (3.7) (3.9)
Amortization of net actuarial (gain) loss (5.4) (0.7)
Net periodic benefit (credit) cost (15.4) $ (7.4)
Contributions and payments related to pension and OPEB plans 0.2  
Estimated future employer contributions for the remainder of the year $ 0.8