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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Numerator:                      
Net income attributable to Reliance (in dollars) $ 67.9 $ 84.9 $ 98.7 $ 92.3 $ 39.5 $ 48.7 $ 61.5 $ 44.7 $ 343.8 $ 194.4 $ 148.2
Denominator for basic earnings per share:                      
Weighted average shares                 74,767,988 74,230,452 73,445,583
Effect of dilutive securities:                      
Stock options (in shares)                 273,765 241,928 256,396
Denominator for dilutive earnings per share:                      
Adjusted weighted average shares and assumed conversions                 75,041,753 74,472,380 73,701,979
Net income per share attributable to Reliance shareholders - diluted (in dollars per share) $ 0.91 $ 1.13 $ 1.31 $ 1.23 $ 0.53 $ 0.65 $ 0.83 $ 0.60 $ 4.58 $ 2.61 $ 2.01
Net income per share attributable to Reliance shareholders - basic (in dollars per share) $ 0.91 $ 1.13 $ 1.32 $ 1.24 $ 0.53 $ 0.65 $ 0.83 $ 0.60 $ 4.60 $ 2.62 $ 2.02
Diluted shares                      
Shares reserved for issuance upon exercise of stock options, not included in the diluted calculation due to their anti-dilutive effect                 3,430,843 2,600,699 3,109,197