Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 691.3	$ 610.9
Operating costs and expenses:
Cost of sales	514.5	482.8
Gross Profit	176.8	128.1
Selling and administrative	50.6	48.7
(Gain) loss on sale or impairment of long lived assets, net	(0.6)	0.6
Other operating credits and charges, net	(0.4)	3.4
Income from operations	127.2	75.4
Non-operating income (expense):
Interest expense, net of capitalized interest	(4.4)	(5.0)
Investment income	3.2	2.0
Other non-operating items	(1.4)	(1.9)
Total non-operating income (expense)	(2.6)	(4.9)
Income from continuing operations before taxes	124.6	70.5
Provision for income taxes	29.7	15.5
Income from continuing operations	94.9	55.0
Loss from discontinued operations before tax	(5.3)	0.0
Benefit for income taxes	(1.3)	0.0
Loss from discontinued operations	(4.0)	0.0
Net income	$ 90.9	$ 55.0
Net income per share of common stock:
Income per share continuing operations	$ 0.66	$ 0.38
Loss per share discontinued operations	(0.03)	0.0
Net income per share - basic	0.63	0.38
Diluted net income per share of common stock
Income per share continuing operations	0.65	0.38
Loss per share discontinued operations	(0.03)	0.00
Net income per share - diluted	$ 0.62	$ 0.38
Weighted average shares of stock outstanding - basic	144.7	144.2
Weighted average shares of stock outstanding - diluted	146.7	145.9