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ACCOUNTING POLICIES (Detail Textuals) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 8 Months Ended | 12 Months Ended | 2 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 8 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Feb. 28, 2011 | Dec. 31, 2013 Goodwill [Member] | Dec. 31, 2012 Goodwill [Member] | Dec. 31, 2011 Goodwill [Member] | Dec. 31, 2013 Customers, customer contracts and relationships [Member] KA Steel [Member] | Aug. 22, 2012 Customers, customer contracts and relationships [Member] KA Steel [Member] | Aug. 31, 2007 Customers, customer contracts and relationships [Member] Pioneer [Member] | Dec. 31, 2013 Customers, customer contracts and relationships [Member] Pioneer [Member] | Feb. 28, 2011 Customers, customer contracts and relationships [Member] SunBelt [Member] | Dec. 31, 2013 Customers, customer contracts and relationships [Member] SunBelt [Member] | Dec. 31, 2013 Trademarks [Member] | Dec. 31, 2012 Trademarks [Member] | Dec. 31, 2011 Trademarks [Member] | Aug. 22, 2013 Trademarks [Member] KA Steel [Member] | Dec. 31, 2013 Other Intangible Assets [Member] KA Steel [Member] | Aug. 22, 2012 Other Intangible Assets [Member] KA Steel [Member] | Aug. 31, 2007 Other Intangible Assets [Member] Pioneer [Member] | Dec. 31, 2013 Other Intangible Assets [Member] Pioneer [Member]
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense for earnout liability | $ 7.9 | $ 11.5 | $ 6.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Equity Investments | 6.5 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 4.2 | 11.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligation non-current | 47.3 | 46.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation, Revision of Estimate | 1.6 | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  | 128.0 |  |  |  |  |  |  |  |  |  | 0.4 |  |
Acquired intangible assets |  |  |  |  |  |  |  |  |  | 19.0 |  | 5.8 |  |  |  |  |  |  |  | 1.2 |
Indefinite-Lived Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.9 |  |  |  |
Amortization period (in years) |  |  |  |  |  |  |  | 10 years 0 months 0 days |  |  | 15 years 0 months 0 days |  | 15 years 0 months 0 days |  |  |  |  | 4 years 0 months 0 days |  |  | 5 years 0 months 0 days
Amortization expense | 14.6 | 6.5 | 1.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 14.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 18.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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