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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share. + References No definition available. + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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