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EMPLOYEE BENEFITS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Components of net periodic benefit cost        
Contributions and payments related to pension and OPEB plans     $ 111.5 $ 19.5
Pension Costs        
Components of net periodic benefit cost        
Service cost $ 10.4 $ 10.7 22.1 22.0
Interest cost 30.2 33.0 61.4 66.2
Expected return on plan assets (48.5) (49.0) (98.1) (98.0)
Loss on plan settlement 5.3 14.1 5.3 14.1
Amortization of prior service cost (credit) 0.8 0.8 1.5 1.7
Amortization of net actuarial loss 21.1 20.2 43.0 40.7
Net periodic benefit (credit) cost 19.3 29.8 35.2 46.7
Contributions and payments related to pension and OPEB plans     107.2  
Estimated future employer contributions for the remainder of the year     6.4  
Other Postretirement Benefit Costs        
Components of net periodic benefit cost        
Service cost 5.6 6.4 11.9 13.1
Interest cost 8.4 9.3 16.9 18.5
Expected return on plan assets (13.6) (13.3) (27.3) (26.4)
Amortization of prior service cost (credit) (2.8) (2.4) (5.6) (4.7)
Amortization of net actuarial loss 0.1 1.9 1.6 4.2
Net periodic benefit (credit) cost $ (2.3) $ 1.9 (2.5) $ 4.7
Contributions and payments related to pension and OPEB plans     4.3  
Estimated future employer contributions for the remainder of the year     $ 5.3