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Debt (Details 2) (USD $) |  |  | 0 Months Ended | 3 Months Ended |  |  | 0 Months Ended | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 0 Months Ended |  |  | 12 Months Ended |  | 3 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012 | Apr. 04, 2013 Subsequent event Third Amended and Restated Credit Agreement item | Mar. 31, 2013 Unsecured revolving credit facility | Dec. 31, 2012 Unsecured revolving credit facility | Apr. 04, 2013 Unsecured revolving credit facility Subsequent event | Apr. 04, 2013 Unsecured revolving credit facility Maximum Subsequent event Third Amended and Restated Credit Agreement | Mar. 31, 2013 Unsecured revolving credit facility LIBOR | Mar. 31, 2013 Unsecured revolving credit facility Bank prime rate | Mar. 31, 2013 Senior unsecured notes due July 2, 2013 | Dec. 31, 2012 Senior unsecured notes due July 2, 2013 | Nov. 30, 2006 Senior Unsecured Notes - Publicly Traded item | Mar. 31, 2013 Senior Unsecured Notes - Publicly Traded | Apr. 12, 2013 Senior Unsecured Notes - Publicly Traded | Nov. 30, 2006 Senior unsecured notes due November 15, 2016 | Mar. 31, 2013 Senior unsecured notes due November 15, 2016 | Dec. 31, 2012 Senior unsecured notes due November 15, 2016 | Nov. 30, 2006 Senior unsecured notes due November 15, 2036 | Mar. 31, 2013 Senior unsecured notes due November 15, 2036 | Dec. 31, 2012 Senior unsecured notes due November 15, 2036 | Apr. 12, 2013 Senior unsecured notes due 2023 Subsequent event | Mar. 31, 2013 Revolving Credit Facilities - Foreign Operations | Dec. 31, 2012 Revolving Credit Facilities - Foreign Operations | Mar. 31, 2013 Unsecured Revolving Credit Facility and Senior Unsecured Notes | Mar. 31, 2013 Unsecured Revolving Credit Facility and Senior Unsecured Notes Minimum | Mar. 31, 2013 Unsecured Revolving Credit Facility and Senior Unsecured Notes Maximum | Mar. 31, 2013 Term loan expiring April 4, 2018 | Apr. 04, 2013 Term loan expiring April 4, 2018 Subsequent event Third Amended and Restated Credit Agreement
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banks as lenders |  |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity under revolving credit facility |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,300,000 |  |  |  |  |  |
Issuance of debt | 1,151,900,000 | 1,208,900,000 |  |  |  |  |  |  |  | 75,000,000 | 75,000,000 |  |  |  |  | 350,000,000 | 350,000,000 |  | 250,000,000 | 250,000,000 | 500,000,000 |  |  |  |  |  |  | 500,000,000
Annual amortization of term loan during the first year (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |
Annual amortization of term loan during the second year (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |
Annual amortization of term loan during the third year (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Annual amortization of term loan during the fourth year (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Annual amortization of term loan during the fifth year (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Additional borrowings available under the credit facility |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  |  | LIBOR | Bank prime rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate added to base (as a percent) |  |  |  |  |  |  |  | 1.50% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused portion of revolving credit facility (as a percent) |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fixed rate (as a percent) |  |  |  | 1.45% | 1.46% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate (as a percent) |  |  |  |  |  |  |  |  |  | 5.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 31,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional amount of letters of credit available to be issued |  |  |  | 218,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined outstanding balances of revolving credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,300,000 | 8,300,000 |  |  |  |  |
Issuance of debt |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  | 350,000,000 |  |  | 250,000,000 |  |  | 500,000,000 |  |  |  |  |  |  |
Number of tranches comprising the debt issuance |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.20% |  |  | 6.85% |  |  | 4.50% |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio, actual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.6 |  |  |  |
Minimum interest coverage ratio required, debt covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |
Leverage ratio, actual (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.50% |  |  |  |
Maximum leverage ratio required under financial covenant (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Minimum net worth requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,190,000,000 |  |  |
Reliance shareholders' equity | $ 3,646,800,000 | $ 3,558,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,650,000,000 |  |  |  |
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% |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89.00% |  |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time. + References No definition available. + 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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + 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 210.5-02.29-31) -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 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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