CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 2,883.5	$ 2,988.9	$ 5,840.1	$ 5,746.0
Costs and expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	2,029.9	2,071.4	4,119.6	4,008.6
Warehouse, delivery, selling, general and administrative	531.4	535.9	1,063.5	1,055.3
Depreciation and amortization	54.4	54.3	108.4	108.4
Impairment of long-lived assets	1.2		1.2
Total costs and expenses	2,616.9	2,661.6	5,292.7	5,172.3
Operating income	266.6	327.3	547.4	573.7
Other (income) expense:
Interest expense	23.7	21.3	47.9	40.6
Other (income) expense, net	(2.9)	(0.6)	(1.8)	1.3
Income before income taxes	245.8	306.6	501.3	531.8
Income tax provision	61.5	73.5	125.4	127.6
Net income	184.3	233.1	375.9	404.2
Less: Net income attributable to noncontrolling interests	1.2	2.3	2.7	4.4
Net income attributable to Reliance	$ 183.1	$ 230.8	$ 373.2	$ 399.8
Earnings per share attributable to Reliance stockholders:
Diluted earnings per common share (in dollars per share)	$ 2.69	$ 3.16	$ 5.49	$ 5.46
Basic earnings per common share (in dollars per share)	$ 2.73	$ 3.19	$ 5.56	$ 5.51
Shares used in computing earning per share:
Diluted (in shares)	67,977	72,988	67,951	73,218
Basic (in shares)	67,045	72,343	67,086	72,580
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.50	$ 1.10	$ 1.00