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
Balance at Dec. 31, 2021		$ 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			1,840.1
Cash dividends			(211.9)
Dividend equivalents paid on vested restricted stock units			(5.2)
Other comprehensive (loss) income				(17.4)		(17.4)
Comprehensive income					4.1	(4.1)
Capital contribution					0.3
Dividends paid					(3.1)
Stock-based compensation		65.3
Taxes paid related to net share settlement of restricted stock units		(0.8)	(38.9)
Repurchase of common shares		(64.5)	(565.8)
Balance at Dec. 31, 2022	$ 7,087.4	0.1	7,173.6	(86.3)	8.5	7,095.9
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			1,335.9			1,335.9
Cash dividends			(233.2)
Dividend equivalents paid on vested restricted stock units			(4.9)
Other comprehensive (loss) income				9.6		9.6
Comprehensive income					4.2	(4.2)
Dividends paid					(2.2)
Stock-based compensation		65.0
Taxes paid related to net share settlement of restricted stock units		(17.0)	(37.1)
Repurchase of common shares		(48.0)	(431.5)
Excise tax on repurchase of common shares			(3.9)
Balance at Dec. 31, 2023	7,722.3	0.1	7,798.9	(76.7)	10.5	7,732.8
Increase (Decrease) in Stockholders' Equity
Net income attributable to Reliance			875.2			875.2
Cash dividends			(245.4)
Dividend equivalents paid on vested restricted stock units			(4.3)
Other comprehensive (loss) income				(38.5)		(38.5)
Comprehensive income					2.8	(2.8)
Acquisition					0.3
Dividends paid					(2.6)
Stock-based compensation		56.8
Taxes paid related to net share settlement of restricted stock units		(25.7)	(17.1)
Repurchase of common shares		(31.1)	(1,062.6)
Excise tax on repurchase of common shares			(10.0)
Balance at Dec. 31, 2024	$ 7,219.6	$ 0.1	$ 7,334.7	$ (115.2)	$ 11.0	$ 7,230.6