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Represents the actual percentage of EBITDA accounted for by the parent and subsidiary guarantors as of the reporting period date.

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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.

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No definition available.

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Represents the percentage of consolidated tangible assets which the subsidiary guarantors together with the entity are required to own under the terms of the financial covenants.

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Represents the number of tranches comprising the debt issuance.

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No definition available.

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No definition available.

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The total additional amount of letters of credit available to be issued as of the reporting date.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Weighted average interest rate of debt outstanding.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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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.

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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.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Other (Details) $ in Millions			1 Months Ended	12 Months Ended
Debt - Other (Details) $ in Millions	Apr. 12, 2013 USD ($)	Apr. 04, 2013 USD ($) item	Nov. 30, 2006 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt
Debt outstanding				$ 1,942.1	$ 2,319.1
Ownership interest in domestic subsidiaries (as a percent)				100.00%
Aggregate maturities of long-term debt for each of the next five years and thereafter
2016				$ 500.8
2017				50.5
2018				631.3
2019				0.6
2020				0.6
Thereafter				758.3
Total				$ 1,942.1
Third Amended and Restated Credit Agreement
Debt
Number of banks as lenders \| item		26
Interest coverage ratio, actual				7.0
Minimum interest coverage ratio required, debt covenant				3.0
Leverage ratio, actual (as a percent)				33.60%
Maximum leverage ratio required under financial covenant (as a percent)				60.00%
Unsecured revolving credit facility
Debt
Maximum borrowing capacity of the credit facility	$ 1,500.0	$ 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)				1.81%	1.42%
Letters of credit outstanding				$ 57.4
Additional amount of letters of credit available to be issued				$ 1,110.0
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%
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%
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%
Actual percentage of total consolidated EBITDA for the parent and subsidiary guarantors				91.00%
Actual percentage of consolidated tangible assets owned by the entity and subsidiary guarantors				83.00%
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)				1.67%	1.42%
Term loan expiring April 4, 2018 \| Third Amended and Restated Credit Agreement
Debt
Issuance of debt		$ 500.0
Other separate revolving credit facilities
Debt
Maximum borrowing capacity of the credit facility				$ 76.2
Lines of credit				59.9	$ 48.3
IRB \| Metals USA
Debt
Debt outstanding				11.0	11.5
Mortgage obligations \| Travel Main
Debt
Debt outstanding				$ 40.4	$ 41.8
Interest rate (as a percent)				6.40%
Lump sum payment on maturity				$ 39.2