PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Estimated Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 5.3	$ 4.1
Interest cost	8.2	8.7
Expected return on plan assets	(18.5)	(13.6)
Prior service cost (credits)	0.2	0.3
Net actuarial loss	6.7	5.9
Net periodic benefit cost (credit)	1.9	5.4
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.5	0.4
Interest cost	2.2	2.3
Expected return on plan assets	(4.5)	(4.2)
Prior service cost (credits)	(0.5)	(0.5)
Net actuarial loss	0.7	1.3
Net periodic benefit cost (credit)	$ (1.6)	$ (0.7)