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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income attributable to Reliance	$ 190.1	$ 169.0
Denominator:
Weighted average shares outstanding (in shares)	67,127	72,818
Dilutive effect of stock-based awards (in shares)	799	632
Weighted average diluted shares outstanding (in shares)	67,926	73,450
Earnings per share attributable to Reliance stockholders - diluted (in dollars per share)	$ 2.80	$ 2.30
Earnings per share attributable to Reliance stockholders - basic (in dollars per share)	$ 2.83	$ 2.32

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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