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Acquisitions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Apr. 04, 2013 Unsecured revolving credit facility | Apr. 30, 2013 Travel Main item | Jun. 30, 2013 Metals USA | Jun. 30, 2013 Metals USA | Jun. 30, 2012 Metals USA | Jun. 30, 2013 Metals USA | Jun. 30, 2012 Metals USA | Apr. 12, 2013 Metals USA item | Apr. 12, 2013 Metals USA Unsecured revolving credit facility | Apr. 12, 2013 Metals USA Term loan expiring April 4, 2018 | Apr. 12, 2013 Metals USA Senior unsecured notes due 2023 | Jun. 30, 2013 GH Metal Solutions, Inc | Jun. 30, 2013 Sunbelt Steel Texas, LLC | Dec. 31, 2012 2012 acquisitions | Jun. 30, 2013 Airport Metals (Australia) Pty Ltd | Jun. 30, 2013 Worthington Steel Vonore | Jun. 30, 2013 National Specialty Alloys, LLC | Jun. 30, 2013 McKey Perforated Products Co., Inc.,
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 20.65 |  |  |  |  |  |  |  |  |  |
Number of service centers acquired |  |  |  |  |  |  |  |  |  |  |  | 48 |  |  |  |  |  |  |  |  |  |
Total transaction value |  |  |  |  |  | $ 75.6 |  |  |  |  |  | $ 1,250.0 |  |  |  |  |  | $ 226.5 |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | 766.8 |  |  |  |  |  |  |  |  |  |
Number of real estate properties of acquired entity which were leased by subsidiaries of our entity |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt assumed |  |  |  |  |  | 43.8 |  |  |  |  |  | 486.1 |  |  |  |  |  | 59.4 |  |  |  |
Net sales | 2,448.3 | 2,209.7 | 4,473.6 | 4,498.0 |  |  | 396.5 |  |  |  |  |  |  |  |  | 30.6 | 22.3 |  | 1.6 | 1.4 | 41.6 | 10.0
Acquired debt not refinanced through proceeds from debt |  |  |  |  |  |  |  |  |  |  |  | 12.3 |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of the credit facility, which used to fund the transaction |  |  |  |  | 1,500.0 |  |  |  |  |  |  |  | 1,500.0 |  |  |  |  |  |  |  |  |
Face amount of debt, proceeds from which is used to fund transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | 500.0 | 500.0 |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  | 11.4 |  |  |  |  |  |  |  |  |  |  |  |
Allocation of the total purchase price of acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  | 3.2 |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  | 205.9 |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  |  |  |  | 382.6 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  | 248.7 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 349.1 |  |  |  |  |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |  |  |  |  |  |  | 182.0 |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  | 220.0 |  |  |  |  |  |  |  |  |  |
Other current and long-term assets |  |  |  |  |  |  |  |  |  |  |  | 9.0 |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  | 1,600.5 |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  | 486.1 |  |  |  |  |  |  |  |  |  |
Deferred taxes |  |  |  |  |  |  |  |  |  |  |  | 235.9 |  |  |  |  |  |  |  |  |  |
Other current and long-term liabilities |  |  |  |  |  |  |  |  |  |  |  | 111.7 |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  |  | 833.7 |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  | 766.8 |  |  |  |  |  |  |  |  |  |
Pro forma: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  | 2,519.2 | 2,746.8 | 5,003.6 | 5,560.4 |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Reliance |  |  |  |  |  |  |  | $ 84.7 | $ 125.2 | $ 172.2 | $ 255.2 |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per common share attributable to Reliance shareholders (in dollars per share) |  |  |  |  |  |  |  | $ 1.09 | $ 1.66 | $ 2.23 | $ 3.38 |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share attributable to Reliance shareholders (in dollars per share) |  |  |  |  |  |  |  | $ 1.10 | $ 1.67 | $ 2.25 | $ 3.40 |  |  |  |  |  |  |  |  |  |  |

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- Definition The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 35 -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 The amount of acquisition cost of a business combination allocated to inventory, including finished goods, work-in-process, and raw materials. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph c -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 The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will not be amortized. Does not include goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 52 -Subparagraph b -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 The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -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 Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph d -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 For an acquired entity, price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -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 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 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 revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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