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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net income attributable to Reliance	$ 199.7	$ 302.9
Denominator:
Weighted average shares outstanding (in shares)	53,075,000	57,340,000
Dilutive effect of stock-based awards (in shares)	324,000	542,000
Weighted average diluted shares outstanding (in shares)	53,399,000	57,882,000
Earnings per share attributable to Reliance stockholders - basic (in dollars per share)	$ 3.76	$ 5.28
Earnings per share attributable to Reliance stockholders - diluted (in dollars per share)	$ 3.74	$ 5.23
Diluted shares
Weighted average shares, respectively, for RSUs and PSUs, not included in the diluted calculation due to their anti-dilutive effect	194,254	103,700

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