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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income attributable to Reliance (in dollars) $ 108.8 $ 98.7 $ 225.0 $ 191.0
Denominator for basic earnings per share:        
Weighted average shares 75,087,057 74,773,715 75,004,840 74,697,185
Effect of dilutive securities:        
Stock options and restricted stock (in shares) 424,192 377,083 464,129 390,572
Denominator for dilutive earnings per share:        
Adjusted weighted average shares and assumed conversions 75,511,249 75,150,798 75,468,969 75,087,757
Net income per share attributable to Reliance shareholders - diluted (in dollars per share) $ 1.44 $ 1.31 $ 2.98 $ 2.54
Net income per share attributable to Reliance shareholders - basic (in dollars per share) $ 1.45 $ 1.32 $ 3.00 $ 2.56
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 2,462,550 3,084,925 2,468,973 3,091,513