POSTRETIREMENT BENEFITS (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 4.3	$ 2.8
Interest cost	83.3	86.5	$ 81.1
Amortization of prior service cost	1.6	2.2	1.9
Curtailments	47.2	0.2	0.0
Net periodic benefit income (cost)	18.7	(25.0)	(20.5)
Included in Other Comprehensive Loss (Pretax) [Abstract]
Liability adjustment	125.4	138.9	14.4
Amortization of prior service costs and actuarial losses	65.6	25.5	33.3
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost [Abstract]
Service cost	1.2	1.1	1.3
Interest cost	2.3	2.7	2.6
Amortization of prior service cost	0.0	(0.1)	(0.1)
Recognized actuarial loss	3.1	2.9	3.7
Curtailments	0.1	0.0	0.0
Net periodic benefit income (cost)	6.7	6.6	7.5
Included in Other Comprehensive Loss (Pretax) [Abstract]
Liability adjustment	(0.1)	3.1	(1.9)
Amortization of prior service costs and actuarial losses	$ (3.2)	$ (2.8)	$ (3.6)