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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net income attributable to Reliance $ 68.6 $ 51.4 $ 90.2 $ 101.3 $ 92.3 $ 95.5 $ 96.5 $ 87.2 $ 311.5 $ 371.5 $ 321.6
Denominator for basic earnings per share:                      
Weighted average shares outstanding (in shares)                 74,096,349 77,682,943 76,844,912
Effect of dilutive securities:                      
Dilutive effect of stock-based awards (in shares)                 805,715 932,996 801,280
Denominator:                      
Weighted average diluted shares outstanding (in shares)                 74,902,064 78,615,939 77,646,192
Net income per share attributable to Reliance shareholders - diluted (in dollars per share) $ 0.94 $ 0.69 $ 1.20 $ 1.30 $ 1.18 $ 1.21 $ 1.22 $ 1.11 $ 4.16 $ 4.73 $ 4.14
Net income per share attributable to Reliance shareholders - basic (in dollars per share) $ 0.96 $ 0.70 $ 1.21 $ 1.31 $ 1.19 $ 1.23 $ 1.24 $ 1.13 $ 4.20 $ 4.78 $ 4.19