POSTRETIREMENT BENEFITS (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 11.1	$ 9.4
Interest cost	86.3	86.6	$ 87.7
Amortization of prior service cost	0.1	2.2	0.0
Net periodic benefit cost	14.5	26.4	37.1
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	100.6	26.9	66.1
Amortization of prior service costs and actuarial losses	(37.0)	(26.9)	(20.4)
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost [Abstract]
Service cost	1.3	1.1	1.2
Interest cost	1.5	1.5	1.6
Amortization of prior service cost	0.0	(2.2)	(2.6)
Recognized actuarial loss	2.4	2.1	2.3
Net periodic benefit cost	(5.2)	(2.5)	(2.5)
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	(2.1)	0.4	(5.1)
Amortization of prior service costs and actuarial losses	$ (2.4)	$ 0.1	$ 0.3