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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net income attributable to Reliance $ 301.4 $ 97.3 $ 103.0 $ 111.7 $ 61.7 $ 49.5 $ 100.9 $ 92.2 $ 613.4 $ 304.3 $ 311.5
Denominator:                      
Weighted average shares outstanding (in shares)                 72,851,021 72,362,513 74,096,349
Dilutive effect of stock-based awards (in shares)                 688,403 758,405 805,715
Weighted average diluted shares outstanding (in shares)                 73,539,424 73,120,918 74,902,064
Earnings per share attributable to Reliance stockholders - diluted (in dollars per share) $ 4.09 $ 1.32 $ 1.40 $ 1.52 $ 0.84 $ 0.68 $ 1.38 $ 1.27 $ 8.34 $ 4.16 $ 4.16
Earnings per share attributable to Reliance stockholders - basic (in dollars per share) $ 4.14 $ 1.33 $ 1.41 $ 1.53 $ 0.85 $ 0.68 $ 1.39 $ 1.28 $ 8.42 $ 4.21 $ 4.20