UNAUDITED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Reliance Stockholders'	Common Stock and Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interests	Total
Balances at Dec. 31, 2022		$ 0.1	$ 7,173.6	$ (86.3)	$ 8.5	$ 7,095.9
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			383.1			383.1
Cash dividends and dividend equivalents			(62.0)
Other comprehensive income (loss)				(0.2)		(0.2)
Comprehensive income					1.3	(1.3)
Dividends paid					(1.1)
Stock-based compensation		13.5
Taxes paid related to net share settlement of restricted stock units		(7.4)	(29.8)
Repurchase of common shares		(6.1)	(32.8)
Balances at Mar. 31, 2023	$ 7,345.7	0.1	7,432.1	(86.5)	8.7	7,354.4
Balances at Dec. 31, 2023		0.1	7,798.9	(76.7)	10.5	7,732.8
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			302.9			302.9
Cash dividends and dividend equivalents			(65.3)
Other comprehensive income (loss)				(16.6)		(16.6)
Comprehensive income					0.9	(0.9)
Dividends paid					(1.1)
Stock-based compensation		13.0
Taxes paid related to net share settlement of restricted stock units		(13.0)	(10.9)
Balances at Mar. 31, 2024	$ 7,932.4	$ 0.1	$ 8,025.6	$ (93.3)	$ 10.3	$ 7,942.7