Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 45.5	$ 35.2
Accounts receivable, net	253.3	245.6
Inventories	313.0	291.0
Prepaid expenses and other current assets	36.6	35.2
Total current assets	648.4	607.0
Property, plant and equipment	2,593.1	2,378.4
Less accumulated depreciation	(807.6)	(752.8)
Property, plant and equipment, net	1,785.5	1,625.6
Goodwill and other intangible assets	73.5	72.2
Investments in affiliated companies	63.9	53.1
Other assets	56.0	42.7
Total assets	2,627.3	2,400.6
Current liabilities:
Current portions of capital lease and term loan	4.3	4.3
Accounts payable	139.5	137.3
Accrued liabilities	127.0	130.3
Total current liabilities	270.8	271.9
Commitments and contingencies (see Note 11)
Long-term debt	817.3	684.4
Other non-current liabilities	208.9	199.4
Total liabilities	1,297.0	1,155.7
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 107.5 shares and 106.7 shares issued at June 30, 2017 and December 31, 2016, respectively	1.1	1.1
Additional paid-in capital	763.1	738.8
Retained earnings	1,360.6	1,254.7
Accumulated other comprehensive loss	(93.0)	(174.4)
Total stockholders' equity including treasury stock value	2,031.8	1,820.2
Less – Treasury stock, at cost, 17.7 shares at June 30, 2017, and 15.3 shares at December 31, 2016	(701.5)	(575.3)
Total stockholders' equity	1,330.3	1,244.9
Total liabilities and stockholders' equity	$ 2,627.3	$ 2,400.6