CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 17,025.0	$ 14,093.3	$ 8,811.9
Costs and expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	11,773.7	9,603.0	6,036.8
Warehouse, delivery, selling, general and administrative	2,504.2	2,306.5	1,874.0
Depreciation and amortization	240.2	230.2	227.3
Impairment of long-lived assets		4.7	108.0
Total costs and expenses	14,518.1	12,144.4	8,246.1
Operating income	2,506.9	1,948.9	565.8
Other expense:
Interest expense	62.3	62.7	62.9
Other expense, net	14.2	3.1	24.7
Income before income taxes	2,430.4	1,883.1	478.2
Income tax provision	586.2	465.7	105.8
Net income	1,844.2	1,417.4	372.4
Less: net income attributable to noncontrolling interests	4.1	4.4	3.3
Net income attributable to Reliance	$ 1,840.1	$ 1,413.0	$ 369.1
Earnings per share attributable to Reliance stockholders:
Basic (in dollars per share)	$ 30.39	$ 22.35	$ 5.74
Diluted (in dollars per share)	$ 29.92	$ 21.97	$ 5.66
Shares used in computing earnings per share:
Basic (in shares)	60,559	63,217	64,328
Diluted (in shares)	61,495	64,327	65,263
Cash dividends per share (in dollars per share)	$ 3.50	$ 2.75	$ 2.50