PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Estimated Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4.6	$ 4.7	$ 12.9	$ 14.0
Interest cost	8.9	7.6	26.2	22.7
Expected return on plan assets	(13.7)	(15.0)	(41.0)	(45.0)
Prior service cost (credits)	0.3	0.6	0.9	1.7
Net actuarial loss	5.9	5.3	17.7	15.9
Net periodic benefit cost (credit)	6.0	3.2	16.7	9.3
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.5	0.6	1.3	1.6
Interest cost	2.3	2.1	7.0	6.2
Expected return on plan assets	(4.2)	(4.6)	(12.6)	(13.8)
Prior service cost (credits)	(0.5)	(0.7)	(1.5)	(2.2)
Net actuarial loss	1.3	1.3	3.8	3.8
Net periodic benefit cost (credit)	$ (0.6)	$ (1.3)	$ (2.0)	$ (4.4)