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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Components of net periodic benefit cost (credit)        
Contributions and payments related to pension and OPEB plans     $ 8.6 $ 7.6
Pension Benefits        
Components of net periodic benefit cost (credit)        
Service cost $ 14.2 $ 13.6 26.6 27.5
Interest cost 22.4 21.7 45.2 43.6
Expected return on plan assets (52.5) (50.1) (105.2) (100.7)
Loss on plan settlement 2.2 1.9 2.2 2.0
Amortization of prior service (credit) cost 0.4 0.4 0.8 0.8
Amortization of net actuarial (gain) loss 19.1 28.2 38.2 55.6
Net periodic benefit (credit) cost 5.8 15.7 7.8 28.8
Contributions and payments related to pension and OPEB plans     5.7  
Estimated future employer contributions for the remainder of the year 5.5   5.5  
Other Postretirement Benefits        
Components of net periodic benefit cost (credit)        
Service cost 3.3 3.6 7.1 7.8
Interest cost 3.8 3.6 7.7 7.2
Expected return on plan assets (17.3) (16.6) (34.5) (33.0)
Amortization of prior service (credit) cost (3.9) (3.9) (7.9) (7.9)
Amortization of net actuarial (gain) loss (6.3) (6.5) (12.3) (12.2)
Net periodic benefit (credit) cost $ (20.4) $ (19.8) (39.9) $ (38.1)
Contributions and payments related to pension and OPEB plans     $ 2.9