Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net sales	$ 5,108.7	$ 6,323.6	$ 5,675.3
Cost of materials sold	4,087.1	5,013.5	4,528.5
Gross profit	1,021.6	1,310.1	1,146.8
Warehousing, delivery, selling, general, and administrative	793.5	735.2	711.2
Gain on sale of assets		(3.8)	(109.6)
Operating profit	228.1	578.7	545.2
Other income (expense):
Interest and other expense on debt	(34.7)	(33.2)	(51.0)
Pension settlement charges			(98.7)
Loss on retirement of debt		(21.3)	(5.5)
Other income and (expense), net	0.3	(1.3)	(0.9)
Income before income taxes	193.7	522.9	389.1
Provision for income taxes	47.3	131.4	93.7
Net income	146.4	391.5	295.4
Less: Net income attributable to noncontrolling interest	0.7	0.5	1.1
Net income attributable to Ryerson Holding Corporation	$ 145.7	$ 391.0	$ 294.3
Basic earnings per share	$ 4.17	$ 10.41	$ 7.67
Diluted earnings per share	4.1	10.21	7.56
Dividends declared per share	$ 0.7175	$ 0.535	$ 0.165