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			768.2			768.2
Cash dividends and dividend equivalents			(120.6)
Other comprehensive loss				(0.3)		(0.3)
Comprehensive income					2.5	(2.5)
Dividends paid					(1.1)
Stock-based compensation		31.6
Taxes paid related to net share settlement of restricted stock units		(7.5)	(29.8)
Repurchase of common shares		(24.1)	(88.7)
Excise tax on repurchase of common shares			(0.6)
Balances at Jun. 30, 2023	$ 7,615.6	0.1	7,702.1	(86.6)	9.9	7,625.5
Balances at Mar. 31, 2023		0.1	7,432.1	(86.5)	8.7	7,354.4
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			385.1			385.1
Cash dividends and dividend equivalents			(58.6)
Other comprehensive loss				(0.1)		(0.1)
Comprehensive income					1.2	(1.2)
Stock-based compensation		18.1
Taxes paid related to net share settlement of restricted stock units		(0.1)
Repurchase of common shares		(18.0)	(55.9)
Excise tax on repurchase of common shares			(0.6)
Balances at Jun. 30, 2023	7,615.6	0.1	7,702.1	(86.6)	9.9	7,625.5
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			570.7			570.7
Cash dividends and dividend equivalents			(127.9)
Other comprehensive loss				(24.8)		(24.8)
Comprehensive income					1.4	(1.4)
Acquisition					0.3
Dividends paid					(2.2)
Stock-based compensation		26.9
Taxes paid related to net share settlement of restricted stock units		(13.2)	(10.9)
Repurchase of common shares		(13.7)	(505.6)
Excise tax on repurchase of common shares			(0.8)
Balances at Jun. 30, 2024	7,623.0	0.1	7,724.4	(101.5)	10.0	7,633.0
Balances at Mar. 31, 2024		0.1	8,025.6	(93.3)	10.3	7,942.7
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			267.8			267.8
Cash dividends and dividend equivalents			(62.6)
Other comprehensive loss				(8.2)		(8.2)
Comprehensive income					0.5	(0.5)
Acquisition					0.3
Dividends paid					(1.1)
Stock-based compensation		13.9
Taxes paid related to net share settlement of restricted stock units		(0.2)
Repurchase of common shares		(13.7)	(505.6)
Excise tax on repurchase of common shares			(0.8)
Balances at Jun. 30, 2024	$ 7,623.0	$ 0.1	$ 7,724.4	$ (101.5)	$ 10.0	$ 7,633.0