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Carrying value as of the balance sheet date of the sum of short-term debt and current maturities of long-term debt and capital lease obligations, which are due within one year (or one business cycle if longer).

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Increase for additional borrowings on the debt instrument during the period.

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Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax and the aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Condensed Consolidating Financial Statements (Details) (USD $) In Millions																			1 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009	Sep. 30, 2011 Parent	Dec. 31, 2010 Parent	Sep. 30, 2010 Parent	Dec. 31, 2009 Parent	Sep. 30, 2011 Guarantor Subsidiaries	Dec. 31, 2010 Guarantor Subsidiaries	Sep. 30, 2010 Guarantor Subsidiaries	Dec. 31, 2009 Guarantor Subsidiaries	Sep. 30, 2011 Non-Guarantor Subsidiaries	Dec. 31, 2010 Non-Guarantor Subsidiaries	Sep. 30, 2010 Non-Guarantor Subsidiaries	Dec. 31, 2009 Non-Guarantor Subsidiaries	Sep. 30, 2011 Eliminations	Dec. 31, 2010 Eliminations	Nov. 30, 2006 Senior Unsecured Notes - Publicly Traded
Consolidating financial statements, captions
Senior unsecured notes issued																			$ 600
ASSETS
Cash and cash equivalents	91.1	72.9	186.5	43.0	29.3	14.4	131.6	9.0	8.5	8.0	16.7	6.9	53.3	50.5	38.2	27.1
Accounts receivable, less allowance for doubtful accounts	1,019.5	697.0			76.0	58.1			841.0	586.2			102.5	52.7
Inventories	1,276.6	860.2			55.6	33.6			1,079.5	770.4			141.5	56.2
Intercompany receivables					0.3	0.3			31.2	12.4			5.8				(37.3)	(12.7)
Other current assets	42.5	70.8			94.5	99.8			29.9	27.3			9.2	5.1			(91.1)	(61.4)
Total current assets	2,429.7	1,700.9			255.7	206.2			1,990.1	1,404.3			312.3	164.5			(128.4)	(74.1)
Investments in subsidiaries					2,157.1	1,783.2			261.0	202.8							(2,418.1)	(1,986.0)
Property, plant and equipment, net	1,087.6	1,025.3			97.3	97.5			918.3	870.3			72.0	57.5
Goodwill	1,231.6	1,109.6			23.8	23.8			1,110.5	1,029.0			97.3	56.8
Intangible assets, net	909.8	755.8			13.8	9.8			754.9	681.1			141.1	64.9
Intercompany receivables					2,351.3	1,956.5			36.1								(2,387.4)	(1,956.5)
Other assets	69.3	77.3			5.2	4.9			62.3	71.4			1.8	1.0
Total assets	5,728.0	4,668.9			4,904.2	4,081.9			5,133.2	4,258.9			624.5	344.7			(4,933.9)	(4,016.6)
Liabilities & Equity
Accounts payable	412.7	245.0			41.0	24.5			343.8	204.6			65.2	28.6			(37.3)	(12.7)
Accrued compensation and retirement costs	100.1	85.1			17.1	14.9			75.8	64.8			7.2	5.4
Other current liabilities	103.2	82.7			49.0	37.6			45.8	40.2			8.4	4.9
Income taxes payable	4.7								20.9				9.3				(25.5)
Deferred income taxes	9.6	9.6							75.2	71.0							(65.6)	(61.4)
Current maturities of long-term debt and short-term borrowings	14.2	86.2			0.3	74.4			0.2				13.7	11.8
Total current liabilities	644.5	508.6			107.4	151.4			561.7	380.6			103.8	50.7			(128.4)	(74.1)
Long-term debt	1,463.9	855.1			1,463.9	854.9				0.2
Intercompany borrowings									2,226.4	1,926.9			161.0	29.6			(2,387.4)	(1,956.5)
Deferred taxes and other long-term liabilities	526.9	475.1			248.2	251.9			252.7	218.2			26.0	5.0
Total Reliance shareholders' equity	3,084.7	2,823.7			3,084.7	2,823.7			2,088.0	1,729.5			330.1	256.5			(2,418.1)	(1,986.0)
Noncontrolling interests	8.0	6.4							4.4	3.5			3.6	2.9
Total equity	3,092.7	2,830.1			3,084.7	2,823.7			2,092.4	1,733.0			333.7	259.4			(2,418.1)	(1,986.0)
Total liabilities and equity	$ 5,728.0	$ 4,668.9			$ 4,904.2	$ 4,081.9			$ 5,133.2	$ 4,258.9			$ 624.5	$ 344.7			$ (4,933.9)	$ (4,016.6)