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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income attributable to Reliance $ 100.9 $ 90.2 $ 193.1 $ 191.5
Denominator for basic earnings per share:        
Weighted average shares outstanding (in shares) 72,372,056 74,316,582 72,150,938 75,710,182
Effect of dilutive securities:        
Dilutive effect of stock-based awards (in shares) 740,752 777,480 759,640 745,267
Denominator:        
Weighted average diluted shares outstanding (in shares) 73,112,808 75,094,062 72,910,578 76,455,449
Net income per share attributable to Reliance shareholders - diluted (in dollars per share) $ 1.38 $ 1.20 $ 2.65 $ 2.50
Net income per share attributable to Reliance shareholders - basic (in dollars per share) $ 1.39 $ 1.21 $ 2.68 $ 2.53