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Debt (Details 2) $ in Millions |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 12, 2013 USD ($) | Apr. 04, 2013 USD ($) item | Nov. 20, 2006 USD ($) | Nov. 20, 2006 USD ($) item | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 2,216.6 | $ 2,319.1
Ownership interest in domestic subsidiaries (as a percent) |  |  |  |  | 100.00% |
Real estate properties portfolio |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 41.1 | $ 41.8
Interest rate (as a percent) |  |  |  |  | 6.40% |
Lump sum payment on maturity |  |  |  |  | $ 39.2 |
Third Amended and Restated Credit Agreement |  |  |  |  |  |
Debt |  |  |  |  |  |
Number of banks as lenders | item |  | 26 |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |
Debt |  |  |  |  |  |
Maximum borrowing capacity of the revolving credit facility |  | $ 1,500.0 |  |  |  |
Commitment fee on unused portion of revolving credit facility (as a percent) |  |  |  |  | 0.20% |
Weighted average fixed interest rate (as a percent) |  |  |  |  | 1.44% | 1.42%
Letters of credit outstanding |  |  |  |  | $ 58.9 |
Available on the revolving credit facility |  |  |  |  | $ 856.1 |
Unsecured revolving credit facility | Third Amended and Restated Credit Agreement |  |  |  |  |  |
Debt |  |  |  |  |  |
Increased maximum borrowing capacity under the credit subject to approval of the lenders and certain other conditions |  | 500.0 |  |  |  |
Unsecured revolving credit facility | LIBOR |  |  |  |  |  |
Debt |  |  |  |  |  |
Variable interest rate |  |  |  |  | LIBOR |
Interest rate added to base (as a percent) |  |  |  |  | 1.25% |
Unsecured revolving credit facility | Bank prime rate |  |  |  |  |  |
Debt |  |  |  |  |  |
Variable interest rate |  |  |  |  | bank prime rate |
Interest rate added to base (as a percent) |  |  |  |  | 0.25% |
Senior Unsecured Notes |  |  |  |  |  |
Debt |  |  |  |  |  |
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% |
Senior unsecured notes issued November 20, 2006 |  |  |  |  |  |
Debt |  |  |  |  |  |
Issuance of debt |  |  | $ 600.0 |  |  |
Number of tranches comprising the debt issuance | item |  |  |  | 2 |  |
Senior unsecured notes due November 15, 2016 |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 350.0 | $ 350.0
Interest rate (as a percent) |  |  | 6.20% | 6.20% |  |
Issuance of debt |  |  |  | $ 350.0 |  |
Senior unsecured notes due November 15, 2036 |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt outstanding |  |  |  |  | 250.0 | 250.0
Interest rate (as a percent) |  |  | 6.85% | 6.85% |  |
Issuance of debt |  |  |  | $ 250.0 |  |
Senior unsecured notes due April 15, 2023 |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 500.0 | $ 500.0
Interest rate (as a percent) | 4.50% |  |  |  |  |
Issuance of debt | $ 500.0 |  |  |  |  |
Unsecured Revolving Credit Facility and Senior Unsecured Notes |  |  |  |  |  |
Debt |  |  |  |  |  |
Ownership interest in domestic subsidiaries (as a percent) |  |  |  |  | 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% |
Term loan expiring April 4, 2018 |  |  |  |  |  |
Debt |  |  |  |  |  |
Annual amortization of term loan thereafter until March 2018 (as a percent) |  |  |  |  | 10.00% |
Weighted average fixed interest rate (as a percent) |  |  |  |  | 1.44% | 1.42%
Term loan expiring April 4, 2018 | Third Amended and Restated Credit Agreement |  |  |  |  |  |
Debt |  |  |  |  |  |
Issuance of debt |  | $ 500.0 |  |  |  |
Term loan expiring April 4, 2018 | LIBOR |  |  |  |  |  |
Debt |  |  |  |  |  |
Variable interest rate |  |  |  |  | LIBOR |
Interest rate added to base (as a percent) |  |  |  |  | 1.25% |
Term loan expiring April 4, 2018 | Bank prime rate |  |  |  |  |  |
Debt |  |  |  |  |  |
Variable interest rate |  |  |  |  | bank prime rate |
Interest rate added to base (as a percent) |  |  |  |  | 0.25% |
Other separate revolving credit facilities |  |  |  |  |  |
Debt |  |  |  |  |  |
Maximum borrowing capacity of the revolving credit facility |  |  |  |  | $ 80.6 |
Debt outstanding |  |  |  |  | 55.3 | $ 48.3
IRB | Metals USA |  |  |  |  |  |
Debt |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 11.5 | $ 11.5

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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