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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
	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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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.

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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.

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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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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.

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