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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net income attributable to Reliance	$ 233.7	$ 267.8	$ 433.4	$ 570.7
Denominator:
Weighted average shares outstanding (in shares)	52,610,000	56,878,000	52,841,000	57,109,000
Dilutive effect of stock-based awards (in shares)	313,000	516,000	319,000	529,000
Weighted average diluted shares outstanding (in shares)	52,923,000	57,394,000	53,160,000	57,638,000
Earnings per share attributable to Reliance stockholders - basic (in dollars per share)	$ 4.44	$ 4.71	$ 8.2	$ 9.99
Earnings per share attributable to Reliance stockholders - diluted (in dollars per share)	$ 4.42	$ 4.67	$ 8.15	$ 9.9
Diluted shares
Weighted average shares, respectively, for RSUs and PSUs, not included in the diluted calculation due to their anti-dilutive effect			99,994	56,217

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