CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 11,534.5	$ 9,721.0	$ 8,613.4
Costs and expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	8,253.0	6,933.2	6,023.1
Warehouse, delivery, selling, general and administrative	2,091.8	1,902.8	1,798.1
Depreciation and amortization	215.2	218.4	222.0
Impairment of long-lived assets	37.0	4.2	52.4
Total costs and expenses	10,597.0	9,058.6	8,095.6
Operating income	937.5	662.4	517.8
Other expense:
Interest	86.2	73.9	84.6
Other expense, net	0.7	4.7	4.0
Income before income taxes	850.6	583.8	429.2
Income tax provision (benefit)	208.8	(37.2)	120.1
Net income	641.8	621.0	309.1
Less: Net income attributable to noncontrolling interests	8.1	7.6	4.8
Net income attributable to Reliance	$ 633.7	$ 613.4	$ 304.3
Earnings per share attributable to Reliance stockholders:
Diluted earnings per common share (in dollars per share)	$ 8.75	$ 8.34	$ 4.16
Basic earnings per common share (in dollars per share)	8.85	8.42	4.21
Cash dividends per share (in dollars per share)	$ 2.00	$ 1.80	$ 1.65