CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Reliance Shareholders'	Common Stock and Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interests	Total
Balances at Dec. 31, 2019		$ 122.2	$ 5,189.5	$ (105.1)	$ 7.5	$ 5,214.1
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			369.1			372.4
Cash dividends and dividend equivalents			(164.1)
Other comprehensive (loss) income				27.2	3.3	27.2
Dividends paid					(2.4)
Stock-based compensation		42.2
Common stock withheld related to net share settlements		(23.1)
Repurchase of common shares		(136.0)	(201.3)			(337.3)
Noncontrolling interest purchased		(5.5)			(1.1)
Stock options exercised		0.3
Balances at Dec. 31, 2020	$ 5,115.4	0.1	5,193.2	(77.9)	7.3	5,122.7
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			1,413.0			1,417.4
Cash dividends and dividend equivalents			(177.0)
Other comprehensive (loss) income				9.0	4.4	9.0
Dividends paid					(4.5)
Stock-based compensation		70.8
Common stock withheld related to net share settlements		(21.2)
Repurchase of common shares		(49.6)	(273.9)			(323.5)
Balances at Dec. 31, 2021	6,086.5	0.1	6,155.3	(68.9)	7.2	6,093.7
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			1,840.1			1,844.2
Cash dividends and dividend equivalents			(217.1)
Other comprehensive (loss) income				(17.4)	4.1	(17.4)
Capital contributions					0.3
Dividends paid					(3.1)
Stock-based compensation		65.3
Common stock withheld related to net share settlements		(39.7)
Repurchase of common shares		(25.6)	(604.7)			(630.3)
Balances at Dec. 31, 2022	$ 7,087.4	$ 0.1	$ 7,173.6	$ (86.3)	$ 8.5	$ 7,095.9