Condensed Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 60.1	$ 35.2
Accounts receivable, net	248.7	245.6
Inventories	314.0	291.0
Prepaid expenses and other current assets	33.9	35.2
Total current assets	656.7	607.0
Property, plant and equipment	2,743.9	2,378.4
Less accumulated depreciation	(877.6)	(752.8)
Property, plant and equipment, net	1,866.3	1,625.6
Goodwill and other intangible assets	148.7	72.2
Investments in affiliated companies	47.7	53.1
Other assets	61.5	42.7
Total assets	2,780.9	2,400.6
Current liabilities:
Short-term borrowings	4.3	4.3
Accounts payable	144.1	137.3
Accrued compensation and benefits	73.0	66.8
Accrued liabilities	40.7	63.5
Total current liabilities	262.1	271.9
Commitments and contingencies (see Note 13)
Long-term debt	805.6	684.4
Retirement obligations	45.4	40.0
Other non-current liabilities	172.7	159.4
Total liabilities	1,285.8	1,155.7
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 107.8 shares and 106.7 shares issued at December 31, 2017 and 2016, respectively	1.1	1.1
Additional paid-in capital	774.3	738.8
Retained earnings	1,496.1	1,254.7
Accumulated other comprehensive loss	(45.0)	(174.4)
Total stockholders' equity including treasury stock value	2,226.5	1,820.2
Less – Treasury stock, at cost, 18.2 shares and 15.3 shares at December 31, 2017 and 2016, respectively	(731.4)	(575.3)
Total stockholders' equity	1,495.1	1,244.9
Total liabilities and stockholders' equity	$ 2,780.9	$ 2,400.6