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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of the quarterly results of operations
Net sales	$ 2,376.4	$ 2,450.1	$ 2,475.2	$ 2,419.3	$ 2,061.6	$ 2,185.2	$ 2,203.9	$ 2,162.7	$ 9,721.0	$ 8,613.4	$ 9,350.5
Cost of sales	1,697.8	1,764.6	1,773.1	1,697.7	1,447.7	1,530.6	1,518.8	1,526.0	6,933.2	6,023.1	6,803.6
Gross profit	678.6	685.5	702.1	721.6	613.9	654.6	685.1	636.7
Net income	303.8	99.0	104.8	113.4	62.9	50.6	102.1	93.5	621.0	309.1	316.2
Net income attributable to Reliance	$ 301.4	$ 97.3	$ 103.0	$ 111.7	$ 61.7	$ 49.5	$ 100.9	$ 92.2	$ 613.4	$ 304.3	$ 311.5
Diluted earnings per common share (in dollars per share)	$ 4.09	$ 1.32	$ 1.40	$ 1.52	$ 0.84	$ 0.68	$ 1.38	$ 1.27	$ 8.34	$ 4.16	$ 4.16
Basic earnings per common share (in dollars per share)	$ 4.14	$ 1.33	$ 1.41	$ 1.53	$ 0.85	$ 0.68	$ 1.39	$ 1.28	$ 8.42	$ 4.21	$ 4.20

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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