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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Numerator:    
Net income attributable to Reliance (in dollars) $ 116.2 $ 92.3
Denominator for basic earnings per share:    
Weighted average shares 74,922,487 74,619,804
Effect of dilutive securities:    
Stock options and restricted stock (in shares) 504,065 404,062
Denominator for dilutive earnings per share:    
Adjusted weighted average shares and assumed conversions 75,426,552 75,023,866
Net income per share attributable to Reliance shareholders - diluted (in dollars per share) $ 1.54 $ 1.23
Net income per share attributable to Reliance shareholders - basic (in dollars per share) $ 1.55 $ 1.24
Diluted shares    
Shares reserved for issuance upon exercise of stock options or vesting of restricted shares respectively, not included in the diluted calculation due to their anti-dilutive effect 2,475,395 3,098,100