CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 14,805.9	$ 17,025.0	$ 14,093.3
Costs and expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	10,258.6	11,773.7	9,603.0
Warehouse, delivery, selling, general and administrative	2,562.4	2,504.2	2,306.5
Depreciation and amortization	245.4	240.2	230.2
Impairment of intangible assets	0.0	0.0	4.7
Total costs and expenses	13,066.4	14,518.1	12,144.4
Operating income	1,739.5	2,506.9	1,948.9
Other (income) expense:
Interest expense	40.1	62.3	62.7
Other (income) expense, net	(41.3)	14.2	3.1
Income before income taxes	1,740.7	2,430.4	1,883.1
Income tax provision	400.6	586.2	465.7
Net income	1,340.1	1,844.2	1,417.4
Less: net income attributable to noncontrolling interests	4.2	4.1	4.4
Net income attributable to Reliance	$ 1,335.9	$ 1,840.1	$ 1,413.0
Earnings per share attributable to Reliance stockholders:
Basic (in dollars per share)	$ 22.90	$ 30.39	$ 22.35
Diluted (in dollars per share)	$ 22.64	$ 29.92	$ 21.97
Shares used in computing earnings per share:
Basic (in shares)	58,328	60,559	63,217
Diluted (in shares)	59,015	61,495	64,327