Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net sales	$ 2,233.4	$ 1,892.5	$ 1,934.8
Operating costs and expenses:
Cost of sales	1,724.0	1,682.7	1,757.8
Depreciation and amortization	112.8	101.9	100.7
Selling and administrative	183.6	152.8	149.5
(Gain) loss on sale or impairment of long lived assets	(8.4)	2.1	(3.1)
Other operating credits and charges, net	17.4	16.3	7.5
Total operating costs and expenses	2,029.4	1,955.8	2,012.4
Income (loss) from operations	204.0	(63.3)	(77.6)
Non-operating income (expense):
Interest expense, net of capitalized interest	(32.1)	(31.2)	(29.8)
Investment income	8.2	4.4	5.5
Other nonoperating items	(15.2)	(5.3)	(3.1)
Total non-operating income (expense)	(39.1)	(32.1)	(27.4)
Income (loss) from continuing operations before income taxes and equity in income of unconsolidated affiliates	164.9	(95.4)	(105.0)
Provision (benefit) for income taxes	19.8	(2.7)	(27.2)
Equity in income of unconsolidated affiliates	(5.2)	(6.7)	(4.4)
Income (loss) from continuing operations	150.3	(86.0)	(73.4)
Loss from discontinued operations before taxes	(0.8)	(3.2)	(3.0)
Benefit for income taxes	(0.3)	(1.1)	(1.0)
Loss from discontinued operations	(0.5)	(2.1)	(2.0)
Net income (loss)	$ 149.8	$ (88.1)	$ (75.4)
Basic net income (loss) per share:
Income (loss) per share from continuing operations	$ 1.05	$ (0.60)	$ (0.52)
Loss per share from discontinued operations	(0.01)	(0.02)	(0.01)
Net income (loss) per share	1.04	(0.62)	(0.53)
Diluted net earnings (loss) per share:
Income (loss) per share from continuing operations	1.03	(0.60)	(0.52)
Loss per share from discontinued operations	0.00	(0.02)	(0.01)
Net income (loss) per share	$ 1.03	$ (0.62)	$ (0.53)
Weighted average number of shares outstanding - basic	143.4	142.4	141.1
Weighted average number of shares outstanding, diluted	145.3	142.4	141.1
Retained Earnings
Non-operating income (expense):
Net income (loss)	$ 149.8	$ (88.1)	$ (75.4)