DEBT (Detail Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended					12 Months Ended				6 Months Ended	12 Months Ended														12 Months Ended		12 Months Ended		12 Months Ended			8 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Notes payable due 2013 [Member]	Dec. 31, 2012 Notes payable due 2013 [Member]	Dec. 31, 2010 Recovery Zone tax Exempt Bonds due 2033 [Member]	Dec. 31, 2013 Recovery Zone tax Exempt Bonds due 2033 [Member]	Dec. 31, 2010 Tax Exempt Bonds Go Zone due 2024 [Member]	Dec. 31, 2010 Tax Exempt Bonds Recovery Zone due 2024 [Member]	Jun. 30, 2012 Industrial Revenue Bond [Member]	Dec. 31, 2013 SunBelt Notes [Member]	Dec. 31, 2012 SunBelt Notes [Member]	Dec. 31, 2011 SunBelt Notes [Member]	Dec. 31, 2013 Notes payable due 2011 [Member]	Dec. 31, 2011 Tax Exempt Bond [Member]	Dec. 31, 2010 Tax Exempt Bond [Member]	Dec. 31, 2011 Variable Interest Rate Swaps $75M [Member]	Jan. 01, 2009 Variable Interest Rate Swaps $75M [Member]	Dec. 31, 2013 Variable Interest Rate Swaps $125M [Member]	Oct. 31, 2011 Variable Interest Rate Swaps $125M [Member]	Dec. 31, 2011 Fixed Interest Rate Swaps 75M [Member]	Dec. 31, 2013 Fixed Interest Rate Swaps $125M [Member]	Dec. 31, 2013 SunBelt Notes [Member]	Jun. 30, 2012 SunBelt Notes [Member]	Dec. 31, 2013 Guaranteed Senior Secured Notes due 2017, Series G [Member]	Dec. 22, 1997 Guaranteed Senior Secured Notes due 2017, Series G [Member]	Dec. 31, 2013 Guaranteed Senior Secured Notes due 2017, Series O [Member]	Dec. 22, 1997 Guaranteed Senior Secured Notes due 2017, Series O [Member]	Dec. 31, 2013 SunBelt [Member]	Feb. 28, 2011 SunBelt [Member]	Dec. 22, 1997 SunBelt [Member]	Aug. 22, 2012 KA Steel [Member]
Debt Instrument [Line Items]
Repayments of Senior Debt	$ 23.7	$ 19.9	$ 87.2	$ 11.4										$ 75.0
Long Term Debt Net Proceeds																																196.0
Payments of Debt Issuance Costs	0	6.0	0																													4.0
Underlying debt instrument [Abstract]
Swap Amount																	75.0		125.0		75.0	125.0		73.1
Amount of gain included in long-term debt										0.2								7.9	6.1	11.0			1.2	2.2
Reduction in interest expense due to interest rate swaps	2.9	3.4	7.2
Revolving credit facility [Abstract]
Maximum amount of senior revolving credit facility	265
Available credit under senior revolving credit facility	233.4
Amount of letters of credit issued under subfacility	31.6
Subfacility of Senior Credit Facitility	110
Canadian Subfacility of Senior Credit Facility	50
Total letters of credit outstanding	36.8
Long-term debt [Abstract]
Notes payable	691.0	713.7		0	11.4	42.0		50.0	20.0		50.7	63.9				70.0
Capital Lease Obligations	4.1	0
Interest rate swap											1.2	1.8
Interest rate				6.50%	6.50%						7.23%	7.23%																	7.23%		7.23%
Amounts due within one year	12.6	23.6
Total long-term debt	678.4	690.1
Drawings on notes						42.0									36.0	34.0
Amount of bond proceeds with trustee classified as noncurrent assets	4.2	11.9					4.2
Unamortized fair value premium											0.8	1.1
Capital Leased Assets, Gross	4.2
Industrial revenue bond activity [Abstract]
Redemption of industrial revenue bonds										7.7	12.2	12.2	12.2
Premium paid to the bond holders										0.2
Deferred gain recognized										0.2								7.9	6.1	11.0			1.2	2.2
Long Term Debt Repayment [Abstract]
Face amount of senior secured notes																										97.5		97.5				200.0
Interest rate				6.50%	6.50%						7.23%	7.23%																	7.23%		7.23%
Required annual debt repayment for Series O and Series G notes																									6.1		6.1		12.2
Fair value of acquired debt																														87.3
Remaining principal balance of consolidated notes																														85.3
Redemption of industrial revenue bonds										7.7	12.2	12.2	12.2
Expected maturities of long-term debt [Abstract]
2014	12.6
2015	12.6
2016	143.7
2017	14.6
2018	0.5
Thereafter	$ 507.0