POSTRETIREMENT BENEFITS (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 8.9	$ 4.3
Interest cost	87.7	83.3	$ 86.5
Amortization of prior service cost	0.0	1.6	2.2
Curtailments	0.0	47.2	0.2
Net periodic benefit income (cost)	(37.1)	18.7	(25.0)
Included in Other Comprehensive Loss (Pretax) [Abstract]
Liability adjustment	66.1	125.4	138.9
Amortization of prior service costs and actuarial losses	20.4	65.6	25.5
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost [Abstract]
Service cost	1.2	1.2	1.1
Interest cost	1.6	2.3	2.7
Amortization of prior service cost	(2.6)	0.0	(0.1)
Recognized actuarial loss	2.3	3.1	2.9
Curtailments	0.0	0.1	0.0
Net periodic benefit income (cost)	2.5	6.7	6.6
Included in Other Comprehensive Loss (Pretax) [Abstract]
Liability adjustment	(5.1)	(0.1)	3.1
Amortization of prior service costs and actuarial losses	$ 0.3	$ (3.2)	$ (2.8)