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Earnings Per Share (Details) (USD $) In Millions, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Numerator:
Net income attributable to Reliance (in dollars)	$ 84.9	$ 48.7	$ 275.9	$ 154.9
Denominator for basic earnings per share:
Weighted average shares (in shares)	74,826,968	74,292,161	74,740,921	74,126,497
Effect of dilutive securities:
Stock options and restricted stock (in shares)	136,159	108,198	305,768	242,579
Denominator for diluted earnings per share:
Adjusted weighted average shares and assumed conversions (in shares)	74,963,127	74,400,359	75,046,689	74,369,076
Net income per share attributable to Reliance shareholders - diluted (in dollars per share)	$ 1.13	$ 0.65	$ 3.68	$ 2.08
Net income per share attributable to Reliance shareholders - basic (in dollars per share)	$ 1.13	$ 0.65	$ 3.69	$ 2.09
Diluted shares
Shares reserved for issuance upon exercise of stock options, not included in the diluted calculation due to their anti-dilutive effect (in shares)	3,859,485	3,954,200	3,347,503	2,759,308

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