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Acquisitions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended | 9 Months Ended | 12 Months Ended |  | 2 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |
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Dec. 31, 2013 item | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Trade names | Dec. 31, 2012 Trade names | Dec. 31, 2011 Trade names | Dec. 31, 2013 Customer relationships | Dec. 31, 2012 Customer relationships | Dec. 31, 2011 Customer relationships | Apr. 04, 2013 Unsecured revolving credit facility | Apr. 30, 2013 Travel Main item | Apr. 12, 2013 Metals USA item | Dec. 31, 2013 Metals USA | Dec. 31, 2013 Metals USA | Dec. 31, 2012 Metals USA | 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 | Dec. 31, 2013 Haskins Steel Co., Inc. (Haskins Steel) | Dec. 31, 2013 GH Metal Solutions, Inc | Dec. 31, 2013 Sunbelt Steel Texas, LLC | Dec. 31, 2013 2013 acquisitions | Dec. 31, 2012 2012 acquisitions | Dec. 31, 2013 2012 acquisitions | Dec. 31, 2013 Airport Metals (Australia) Pty Ltd | Dec. 31, 2013 Worthington Steel Vonore | Dec. 31, 2013 National Specialty Alloys, LLC | Dec. 31, 2013 McKey Perforated Products Co., Inc., | Dec. 31, 2013 2011 acquisitions | Dec. 31, 2011 2011 acquisitions | Aug. 01, 2011 2011 acquisitions item
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,306.7 | $ 2,443.5 | $ 2,448.3 | $ 2,025.3 | $ 1,889.0 | $ 2,055.3 | $ 2,209.7 | $ 2,288.3 | $ 9,223.8 | $ 8,442.3 | $ 8,134.7 |  |  |  |  |  |  |  |  |  |  | $ 1,240.0 |  |  |  |  |  | $ 4.3 | $ 59.1 | $ 43.2 |  |  |  | $ 2.8 | $ 2.7 | $ 77.2 | $ 18.9 | $ 414.1 |  |
Number of real estate properties of acquired entity which were leased by subsidiaries of reporting entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total transaction value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78.9 | 1,250.0 |  |  |  |  |  |  |  |  |  |  | 226.5 |  |  |  |  |  |  |  |
Value of debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43.8 | 486.1 |  |  |  |  |  |  |  |  |  |  | 59.4 |  |  |  |  |  |  |  |
Number of service centers acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 766.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired debt not refinanced through proceeds from debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt, proceeds from which is used to fund transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500.0 | 500.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of the revolving credit facility, which used to fund the transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500.0 |  |  |  |  |  | 1,500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations of the acquiree entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12
Number of countries of the acquiree entity | 10 |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7
Allocation of the total purchase price of acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.2 | 3.2 |  |  |  |  |  |  |  |  | 0.2 |  |  |  |  |  |  | 22.8 |
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 206.0 | 206.0 |  |  |  |  |  |  |  |  | 32.5 |  |  |  |  |  |  | 55.7 |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 379.5 | 379.5 |  |  |  |  |  |  |  |  | 55.0 |  |  |  |  |  |  | 125.9 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 242.6 | 242.6 |  |  |  |  |  |  |  |  | 30.7 |  |  |  |  |  |  | 28.8 |
Goodwill | 1,691.6 |  |  |  | 1,314.6 |  |  |  | 1,691.6 | 1,314.6 | 1,244.3 | 1,109.6 |  |  |  |  |  |  |  |  |  | 381.5 | 381.5 |  |  |  |  |  |  |  |  | 68.0 |  |  |  |  |  |  | 138.5 |
Intangible assets subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137.6 | 137.6 |  |  |  |  |  |  |  |  | 45.1 |  |  |  |  |  |  | 103.7 |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  | 206.8 | 37.9 | 70.6 |  |  |  |  |  |  | 203.0 | 203.0 |  |  |  |  |  |  |  |  | 37.9 |  |  |  |  |  |  | 70.6 |
Other current and long-term assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.1 | 9.1 |  |  |  |  |  |  |  |  | 1.2 |  |  |  |  |  |  | 1.8 |
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,562.5 | 1,562.5 |  |  |  |  |  |  |  |  | 270.6 |  |  |  |  |  |  | 547.8 |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 486.1 | 486.1 |  |  |  |  |  |  |  |  | 59.4 |  |  |  |  |  |  | 104.7 |
Deferred taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 184.4 | 184.4 |  |  |  |  |  |  |  |  | 20.6 |  |  |  |  |  |  | 56.9 |
Other current and long-term liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.2 | 125.2 |  |  |  |  |  |  |  |  | 23.5 |  |  |  |  |  |  | 50.1 |
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 795.7 | 795.7 |  |  |  |  |  |  |  |  | 103.5 |  |  |  |  |  |  | 211.7 |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 766.8 | 766.8 |  |  |  |  |  |  |  |  | 167.1 |  |  |  |  |  |  | 336.1 |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  |  | 135.3 | 44.3 | 101.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  | 206.8 | 37.9 | 70.6 |  |  |  |  |  |  | 203.0 | 203.0 |  |  |  |  |  |  |  |  | 37.9 |  |  |  |  |  |  | 70.6 |
Weighted average lives of identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 years 6 months | 10 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax deductible goodwill amount | 554.6 |  |  |  |  |  |  |  | 554.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106.7 |  | 30.3 |  |  |  |  | 4.5 |  |
Pro forma financial information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,753.8 | 10,425.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Reliance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 328.9 | $ 444.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per common share attributable to Reliance shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.24 | $ 5.88 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share attributable to Reliance shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.28 | $ 5.91 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The pro forma acquisition and related costs for the period, as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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- Definition Amount of current and long-term debt assumed at the acquisition date. + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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