CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 2,450.1	$ 2,185.2	$ 7,344.6	$ 6,551.8
Costs and expenses:
Cost of sales (exclusive of depreciation and amortization shown below)	1,764.6	1,530.6	5,235.4	4,575.4
Warehouse, delivery, selling, general and administrative	470.0	453.0	1,422.1	1,357.7
Depreciation and amortization	54.0	55.1	164.2	166.7
Impairment of long-lived assets	2.8	51.7	2.8	51.7
Total costs and expenses	2,291.4	2,090.4	6,824.5	6,151.5
Operating income	158.7	94.8	520.1	400.3
Other income (expense):
Interest expense	19.1	22.2	54.9	65.6
Other (income) expense, net	(2.6)	2.1	2.1	3.4
Income before income taxes	142.2	70.5	463.1	331.3
Income tax provision	43.2	19.9	145.9	85.1
Net income	99.0	50.6	317.2	246.2
Less: Net income attributable to noncontrolling interests	1.7	1.1	5.2	3.6
Net income attributable to Reliance	$ 97.3	$ 49.5	$ 312.0	$ 242.6
Earnings per share attributable to Reliance stockholders:
Diluted earnings per common share (in dollars per share)	$ 1.32	$ 0.68	$ 4.24	$ 3.32
Basic earnings per common share (in dollars per share)	1.33	0.68	4.28	3.36
Cash dividends per share (in dollars per share)	$ 0.45	$ 0.425	$ 1.35	$ 1.225