ACQUISITIONS (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended							2 Months Ended	3 Months Ended	10 Months Ended	12 Months Ended					12 Months Ended		12 Months Ended		4 Months Ended	12 Months Ended				12 Months Ended			12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 22, 2012	Feb. 28, 2011	Dec. 31, 2012 Trademarks [Member]	Dec. 31, 2011 Trademarks [Member]	Feb. 28, 2011 SunBelt [Member] T	Jun. 30, 2011 SunBelt [Member]	Dec. 31, 2011 SunBelt [Member]	Dec. 31, 2012 SunBelt [Member]	Dec. 31, 2011 SunBelt [Member]	Dec. 31, 2010 SunBelt [Member]	Aug. 22, 2012 SunBelt [Member]	Dec. 22, 1997 SunBelt [Member]	Dec. 31, 2012 SunBelt [Member] Guaranteed Senior Secured Notes due 2017, Series O [Member]	Dec. 22, 1997 SunBelt [Member] Guaranteed Senior Secured Notes due 2017, Series O [Member]	Dec. 31, 2012 SunBelt [Member] Guaranteed Senior Secured Notes due 2017, Series G [Member]	Dec. 22, 1997 SunBelt [Member] Guaranteed Senior Secured Notes due 2017, Series G [Member]	Dec. 31, 2012 KA Steel [Member]	Dec. 31, 2012 KA Steel [Member]	Dec. 31, 2011 KA Steel [Member]	Dec. 31, 2010 KA Steel [Member]	Aug. 22, 2012 KA Steel [Member]	Dec. 31, 2012 KA Steel [Member] Customers, customer contracts and relationships [Member]	Aug. 22, 2012 KA Steel [Member] Customers, customer contracts and relationships [Member]	Aug. 22, 2012 KA Steel [Member] Trademarks [Member]	Dec. 31, 2012 KA Steel [Member] Other Intangible Assets [Member]	Aug. 22, 2012 KA Steel [Member] Other Intangible Assets [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired												100.00%	50.00%			50.00%																100.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid																$ 132.3																$ 336.6
Business Acquisition Purchase Price Adjustment																																1.9
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents																8.9																26.2
Debt Instrument, Face Amount																									97.5		97.5					200.0
Interest rate																			7.23%				7.23%
Long Term Debt Net Proceeds																													196.0
Payments of Debt Issuance Costs									6.0	0	1.0																		4.0
Sales	587.6	581.2	508.7	507.2	445.8	550.2	529.1	436.0	2,184.7	1,961.1	1,585.9							170.5										156.3
Income before taxes									225.2	379.4	76.9							27.2										4.5
Depreciation and amortization									110.9	99.3	86.9																	5.5
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables																																63.1
Business Acquisition Contracted Receivables Acquired																																63.5
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities	10.0								10.0							27.6																10.0
Acquired Finite-lived Intangible Asset, Amount																5.8																		128.0			0.4
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life																			15														10			4
Acquired Indefinite-lived Intangible Asset, Amount														10.9	0																				10.9
Business Acquisition, Purchase Price Allocation, Goodwill Amount																327.1																119.7
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount																163.7																119.7
Amortization Expense Fair Value Of Acquired Identifiable Intangible Assets																				0.1	0.3								8.0	12.4	10.1
( Increase) Reduction of Depreciation Expense Fair Value Adjustment Property Plant And Equipment																				1.0	5.8								(0.2)	(0.3)	(0.5)
Increase in interest expense due to debt issuance for acquisition																													7.1	11.0	11.0
Eliminatation of intersegment sales																													23.2	45.2	27.2
Business Combination, Acquisition Related Costs									8.3	0.8	0							0.8		0.8									8.3
Reduction Of Interest Expense From Change Of Carrying Value Of Acquired Debt Obligations To Estimated Fair Value																				0.1	0.5
Additional Other Expense Acquisition																				0.4	2.7
Pro Forma Increase (Decrease) Of Tax Provision																				2.3	7.3								1.1	(6.0)	(7.6)
Ownership Percentage Of entity After Acquistion																100.00%
Membrane Technology Capacity Of Plant																350,000
Additional Cash Consideration For Acquistion																	6.0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage													50.00%									50.00%
Debt Instrument, Periodic Payment																			12.2					6.1		6.1
Fair value of acquired debt																87.3
Long-term Debt, Gross																85.3
Total earnings of non-consolidated affiliates									3.0	9.6	29.9					6.3
Equity Method Investments	29.3				27.6				29.3	27.6						(0.8)
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain										181.4										181.4
Discrete Deferred Tax Expense Benefit Acquisition																				76.0
Business Acquisition, Purchase Price Allocation, Current Liabilities, Long-term Debt																12.2
Aquiree Income Loss Before Acquisition Costs Interest Expense And Other Expenses																		38.7
Acquiree Interest Expense																		4.0
ExpenseForEarnOutLiability																		$ 6.7