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Debt (Details 2) (USD $) In Millions, unless otherwise specified |  |  | 0 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  |  | 0 Months Ended |  |  |  | 3 Months Ended | 0 Months Ended |  |  |
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Mar. 31, 2014 | Dec. 31, 2013 | Apr. 04, 2013 Third Amended and Restated Credit Agreement item | Mar. 31, 2014 Unsecured revolving credit facility | Dec. 31, 2013 Unsecured revolving credit facility | Apr. 02, 2013 Unsecured revolving credit facility | Apr. 04, 2013 Unsecured revolving credit facility Third Amended and Restated Credit Agreement | Mar. 31, 2014 Unsecured revolving credit facility LIBOR | Mar. 31, 2014 Unsecured revolving credit facility Bank prime rate | Mar. 31, 2014 Senior Unsecured Notes - Publicly Traded | Nov. 30, 2006 Senior unsecured notes due November 20, 2006 item | Nov. 30, 2006 Senior unsecured notes due November 15, 2016 | Mar. 31, 2014 Senior unsecured notes due November 15, 2016 | Dec. 31, 2013 Senior unsecured notes due November 15, 2016 | Nov. 30, 2006 Senior unsecured notes due November 15, 2036 | Mar. 31, 2014 Senior unsecured notes due November 15, 2036 | Dec. 31, 2013 Senior unsecured notes due November 15, 2036 | Apr. 12, 2013 Senior unsecured notes due April 15, 2023 | Mar. 31, 2014 Senior unsecured notes due April 15, 2023 | Dec. 31, 2013 Senior unsecured notes due April 15, 2023 | Mar. 31, 2014 Unsecured Revolving Credit Facility and Senior Unsecured Notes | Mar. 31, 2014 Term loan expiring April 4, 2018 | Apr. 04, 2013 Term loan expiring April 4, 2018 Third Amended and Restated Credit Agreement | Mar. 31, 2014 Other separate revolving credit facilities | Dec. 31, 2013 Other separate revolving credit facilities | Mar. 31, 2014 IRB Metals USA | Mar. 31, 2014 Mortgage obligations Travel Main
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banks as lenders |  |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of the credit facility |  |  |  |  |  | $ 1,500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.6 |  |  |
Debt outstanding | 2,131.0 | 2,112.3 |  |  |  |  |  |  |  |  |  |  | 350.0 | 350.0 |  | 250.0 | 250.0 |  | 500.0 | 500.0 |  |  |  |  |  | 11.9 | 42.7
Annual amortization of term loan through March 2015 (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Annual amortization of term loan thereafter until March 2018 (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Increased maximum borrowing capacity under the credit subject to approval of the lenders and certain other conditions |  |  |  |  |  |  | 500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  |  | LIBOR | Bank prime rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate added to base (as a percent) |  |  |  |  |  |  |  | 1.25% | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused portion of revolving credit facility (as a percent) |  |  |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fixed interest rate (as a percent) |  |  |  | 1.40% | 1.41% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 59.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional amount of letters of credit available to be issued |  |  |  | 190.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined outstanding balances of revolving credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.8 | 9.5 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 6.20% |  |  | 6.85% |  |  | 4.50% |  |  |  |  |  |  |  |  | 6.40%
Lump sum payment on maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.2
Issuance of debt |  |  |  |  |  |  |  |  |  |  | $ 600.0 | $ 350.0 |  |  | $ 250.0 |  |  | $ 500.0 |  |  |  |  | $ 500.0 |  |  |  |
Number of tranches comprising the debt issuance |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in domestic subsidiaries (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Minimum percentage of consolidated EBITDA required for the entity and subsidiary guarantors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |
Minimum percentage of consolidated tangible assets required for the entity and subsidiary guarantors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |

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- Definition Represents the minimum percentage of consolidated earnings before interest, taxes, depreciation and amortization (EBITDA), which the subsidiary guarantors together with the entity are required to maintain. + References No definition available. + Details
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- Definition Represents the percentage of consolidated tangible assets which the subsidiary guarantors together with the entity required to own under the terms of the financial covenants. + References No definition available. + Details
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- Definition Represents the number of tranches comprising the debt issuance. + References No definition available. + Details
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- Definition Represents the percentage of annual amortization of term loan after specified period. + References No definition available. + Details
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- Definition Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be redeemed by the entity in the event of a change of control or downgrade of the entity's credit rating. + References No definition available. + Details
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- Definition The total additional amount of letters of credit available to be issued as of the reporting date. + References No definition available. + Details
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- Definition Represents the number of banks as lenders of the line of credit facility. + References No definition available. + Details
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- Definition Increased maximum borrowing capacity under the credit subject to approval of the lenders and certain other conditions. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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