PENSION PLANS AND RETIREMENT BENEFITS (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Benefits
Service cost	$ 3.0	$ 3.1
Interest cost	18.7	23.6
Expected return on plans’ assets	(35.6)	(35.3)
Recognized actuarial loss	11.2	6.8
Net periodic benefit (income) cost	(2.7)	(1.8)
Other Postretirement Benefits
Service cost	0.3	0.3
Interest cost	0.4	0.4
Expected return on plans’ assets	0.0	0.0
Recognized actuarial loss	0.7	0.6
Net periodic benefit (income) cost	$ 1.4	$ 1.3