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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income attributable to Reliance	$ 165.6	$ 162.7	$ 183.1	$ 190.1	$ 85.6	$ 148.3	$ 230.8	$ 169.0	$ 701.5	$ 633.7	$ 613.4
Denominator:
Weighted average shares outstanding (in shares)									66,885	71,621	72,851
Dilutive effect of stock-based awards (in shares)									970	820	688
Weighted average diluted shares outstanding (in shares)									67,855	72,441	73,539
Earnings per share attributable to Reliance stockholders - diluted (in dollars per share)	$ 2.44	$ 2.40	$ 2.69	$ 2.80	$ 1.22	$ 2.03	$ 3.16	$ 2.30	$ 10.34	$ 8.75	$ 8.34
Earnings per share attributable to Reliance stockholders - basic (in dollars per share)	$ 2.48	$ 2.44	$ 2.73	$ 2.83	$ 1.23	$ 2.06	$ 3.19	$ 2.32	$ 10.49	$ 8.85	$ 8.42

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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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