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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Components of net periodic benefit cost        
Contributions and payments related to pension and OPEB plans     $ 13.8 $ 115.4
Pension Costs        
Components of net periodic benefit cost        
Service cost $ 11.9 $ 11.1 35.7 33.2
Interest cost 28.5 30.3 85.5 91.7
Expected return on plan assets (49.2) (48.8) (147.6) (146.9)
Loss on plan settlement 0.4 2.9 1.1 8.2
Amortization of prior service (credit) cost 0.7 0.7 2.0 2.2
Amortization of net actuarial loss 23.6 21.5 70.6 64.5
Net periodic benefit (credit) cost 15.9 17.7 47.3 52.9
Contributions and payments related to pension and OPEB plans     9.8  
Estimated future employer contributions for the remainder of the year 2.8   2.8  
Other Postretirement Benefit Costs        
Components of net periodic benefit cost        
Service cost 5.9 6.0 17.7 17.9
Interest cost 7.5 8.4 22.4 25.3
Expected return on plan assets (14.9) (13.6) (44.6) (40.9)
Amortization of prior service (credit) cost (3.8) (2.8) (11.5) (8.4)
Amortization of net actuarial loss 0.3 0.7 0.8 2.3
Net periodic benefit (credit) cost (5.0) $ (1.3) (15.2) $ (3.8)
Contributions and payments related to pension and OPEB plans     4.0  
Estimated future employer contributions for the remainder of the year $ 4.1   $ 4.1