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Debt (Details 2) (USD $) In Millions, unless otherwise specified			0 Months Ended	3 Months Ended					3 Months Ended		9 Months Ended	1 Months Ended				1 Months Ended			0 Months Ended				9 Months Ended	0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Apr. 04, 2013 Third Amended and Restated Credit Agreement item	Sep. 30, 2014 Unsecured revolving credit facility due April 4, 2018	Dec. 31, 2013 Unsecured revolving credit facility due April 4, 2018	Dec. 31, 2013 Unsecured credit facility	Apr. 04, 2013 Unsecured credit facility	Apr. 04, 2013 Unsecured credit facility Third Amended and Restated Credit Agreement	Sep. 30, 2014 Unsecured credit facility LIBOR	Sep. 30, 2014 Unsecured credit facility Bank prime rate	Sep. 30, 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	Sep. 30, 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	Sep. 30, 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	Sep. 30, 2014 Senior unsecured notes due April 15, 2023	Dec. 31, 2013 Senior unsecured notes due April 15, 2023	Sep. 30, 2014 Unsecured Revolving Credit Facility and Senior Unsecured Notes	Sep. 30, 2014 Term loan expiring April 4, 2018	Apr. 04, 2013 Term loan expiring April 4, 2018 Third Amended and Restated Credit Agreement	Sep. 30, 2014 Other separate revolving credit facilities	Dec. 31, 2013 Other separate revolving credit facilities	Sep. 30, 2014 IRB Metals USA	Dec. 31, 2013 IRB Metals USA	Sep. 30, 2014 Mortgage obligations Travel Main	Dec. 31, 2013 Mortgage obligations Travel Main
Debt
Number of banks as lenders			26
Maximum borrowing capacity of the credit facility							$ 1,500.0																		$ 86.4
Debt outstanding	2,325.0	2,112.3		667.0	480.0									350.0	350.0		250.0	250.0		500.0	500.0						11.6	11.9	42.1	43.0
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
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)				1.42%		1.41%
Letters of credit outstanding				58.7
Revolving credit available to borrow on				774.3																					52.0	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%

X

- 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.

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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.

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- Definition

Represents the number of tranches comprising the debt issuance.

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- Definition

Represents the lump sum amount payable at the maturity of the debt instrument.

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- Definition

Represents the percentage of annual amortization of term loan after specified period.

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Represents the percentage of annual amortization of term loan through specified period.

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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.

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No definition available.

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- Definition

Represents the number of banks as lenders of the line of credit facility.

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- Definition

Increased maximum borrowing capacity under the credit subject to approval of the lenders and certain other conditions.

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- Definition

Represents the parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

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

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

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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- 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.

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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.

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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.

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No definition available.

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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.

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