PENSION PLANS AND RETIREMENT BENEFITS (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Benefits
Service cost	$ 2.7	$ 2.5	$ 5.8	$ 5.2
Interest cost	23.7	21.7	47.3	43.3
Expected return on plans’ assets	(35.5)	(36.6)	(70.8)	(73.4)
Recognized actuarial loss	6.6	8.5	13.4	17.3
Net periodic benefit (income) cost	(2.5)	(3.9)	(4.3)	(7.6)
Other Postretirement Benefits
Service cost	0.3	0.4	0.6	0.7
Interest cost	0.5	0.4	0.9	0.8
Expected return on plans’ assets	0.0	0.0	0.0	0.0
Recognized actuarial loss	0.5	0.6	1.1	1.2
Net periodic benefit (income) cost	$ 1.3	$ 1.4	$ 2.6	$ 2.7