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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net income attributable to Reliance $ 129.6 $ 97.6 $ 80.2 $ 61.7 $ 165.6 $ 162.7 $ 183.1 $ 190.1 $ 369.1 $ 701.5 $ 633.7
Denominator:                      
Weighted average shares outstanding (in shares)                 64,328,000 66,885,000 71,621,000
Dilutive effect of stock-based awards (in shares)                 935,000 970,000 820,000
Weighted average diluted shares outstanding (in shares)                 65,263,000 67,855,000 72,441,000
Earnings per share attributable to Reliance stockholders - diluted (in dollars per share) $ 2.01 $ 1.51 $ 1.24 $ 0.92 $ 2.44 $ 2.40 $ 2.69 $ 2.80 $ 5.66 $ 10.34 $ 8.75
Earnings per share attributable to Reliance stockholders - basic (in dollars per share) $ 2.04 $ 1.53 $ 1.26 $ 0.93 $ 2.48 $ 2.44 $ 2.73 $ 2.83 $ 5.74 $ 10.49 $ 8.85
Diluted shares                      
Weighted average shares, respectively, for RSU's, not included in the diluted calculation due to their anti-dilutive effect                 183,508 176,013 123,701