CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CONSOLIDATED STATEMENT OF INCOME
Net sales	$ 13,835.0	$ 14,805.9	$ 17,025.0
Costs and expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	9,728.4	10,258.6	11,773.7
Warehouse, delivery, selling, general and administrative	2,666.2	2,562.4	2,504.2
Depreciation and amortization	268.7	245.4	240.2
Impairment	11.7
Total costs and expenses	12,675.0	13,066.4	14,518.1
Operating income	1,160.0	1,739.5	2,506.9
Other (income) expense:
Interest expense	40.3	40.1	62.3
Other (income) expense, net	(20.2)	(41.3)	14.2
Income before income taxes	1,139.9	1,740.7	2,430.4
Income tax provision	261.9	400.6	586.2
Net income	878.0	1,340.1	1,844.2
Less: net income attributable to noncontrolling interests	2.8	4.2	4.1
Net income attributable to Reliance	$ 875.2	$ 1,335.9	$ 1,840.1
Earnings per share attributable to Reliance stockholders:
Basic (in dollars per share)	$ 15.7	$ 22.9	$ 30.39
Diluted (in dollars per share)	$ 15.56	$ 22.64	$ 29.92
Shares used in computing earnings per share:
Basic (in shares)	55,746	58,328	60,559
Diluted (in shares)	56,246	59,015	61,495