ACCOUNTING POLICIES (Detail Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended			26 Months Ended		12 Months Ended		26 Months Ended	12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Feb. 28, 2011	Dec. 31, 2012 Facility Exit Costs [Member]	Dec. 31, 2011 Facility Exit Costs [Member]	Dec. 31, 2012 Facility Exit Costs [Member]	Dec. 31, 2012 Customers, customer contracts and relationships [Member] KA Steel [Member]	Aug. 22, 2012 Customers, customer contracts and relationships [Member] KA Steel [Member]	Dec. 31, 2012 Customers, customer contracts and relationships [Member] Pioneer [Member]	Aug. 31, 2007 Customers, customer contracts and relationships [Member] Pioneer [Member]	Dec. 31, 2012 Customers, customer contracts and relationships [Member] SunBelt [Member]	Feb. 28, 2011 Customers, customer contracts and relationships [Member] SunBelt [Member]	Aug. 22, 2012 Trademarks [Member] KA Steel [Member]	Dec. 31, 2012 Other Intangible Assets [Member] KA Steel [Member]	Aug. 22, 2012 Other Intangible Assets [Member] KA Steel [Member]	Dec. 31, 2012 Other Intangible Assets [Member] Pioneer [Member]	Aug. 31, 2007 Other Intangible Assets [Member] Pioneer [Member]
Accounting Policies [Abstract]
Expense for earnout liability	$ 11.5	$ 6.7
Recovery of investment written off			1.4
Corporate debt securities			26.6
Pretax gain on acquisition of SunBelt		181.4
Percentage of ownership in SunBelt prior to acquiring remaining 50%					50.00%
Amount of bond proceeds with trustee classified as noncurrent assets	11.9	51.7		11.9
Asset retirement obligation non-current	46.5	55.9		46.5
Asset Retirement Obligation, Revision of Estimate	2.5	(0.1)
Asset retirement obligation favorable settlement		1.5
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets										128.0		19.0		5.8			0.4		1.2
Indefinite-Lived Intangible Assets (Excluding Goodwill)															10.9
Amortization period (in years)									10		15		15			4		5
Restructuring charges	8.5	10.7	34.2	53.4		2.1	1.0	9.8
Amortization expense	6.5	1.9	1.5
Amortization expense expected in year one	14.6
Amortization expense expected in year two	14.6
Amortization expense expected in year three	14.6
Amortization expense expected in year four	14.6
Amortization expense expected in year five	$ 14.5
Average remaining life expectancy of the inactive participants in the defined benefit pension plan (in years)	18	18		18