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PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Benefits        
Service cost $ 3.3 $ 2.4 $ 8.5 $ 6.9
Interest cost 21.5 21.8 64.8 65.0
Expected return on plans’ assets (36.5) (37.3) (109.9) (111.8)
Amortization of prior service cost 0.0 0.0 0.0 0.0
Recognized actuarial loss 8.6 6.8 25.9 20.2
Net periodic benefit (income) cost (3.1) (6.3) (10.7) (19.7)
Other Postretirement Benefits        
Service cost 0.3 0.3 1.0 0.9
Interest cost 0.3 0.3 1.1 1.1
Expected return on plans’ assets 0.0 0.0 0.0 0.0
Amortization of prior service cost 0.0 (0.6) 0.0 (1.9)
Recognized actuarial loss 0.6 0.6 1.8 1.9
Net periodic benefit (income) cost $ 1.2 $ 0.6 $ 3.9 $ 2.0