SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions								3 Months Ended							12 Months Ended
	Nov. 23, 2015	Aug. 25, 2015	May 26, 2015	Mar. 03, 2015	Nov. 25, 2014	Aug. 26, 2014	May 20, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
Approved quarterly cash dividends (in dollar per share)								$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Dividends paid (in dollar per share)	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Amortization of Net Loss [Member]
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
Total before income taxes															$ (21.9)	$ (25.7)	$ (19.6)
Amortization of Prior Service Credit [Member]
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
Total before income taxes															10.7	4.5	4.5
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Amounts recognized as a component of net periodic pension and other postretirement benefit cost:
Total before income taxes															(11.2)	(21.2)	(15.1)
Income tax benefit															3.8	7.4	5.3
Total reclassifications for the period, net of income taxes															$ (7.4)	$ (13.8)	$ (9.8)