Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 35.2	$ 51.8
Accounts receivable, net	245.6	234.0
Inventories	291.0	307.2
Prepaid expenses and other current assets	35.2	40.8
Total current assets	607.0	633.8
Property, plant and equipment	2,378.4	2,099.4
Less accumulated depreciation	(752.8)	(673.8)
Property, plant and equipment, net	1,625.6	1,425.6
Goodwill and other intangible assets	72.2	58.9
Investments in affiliated companies	53.1	30.4
Other assets	42.7	38.7
Total assets	2,400.6	2,187.4
Current liabilities:
Short-term borrowings	4.3
Accounts payable	137.3	148.9
Accrued compensation and benefits	66.8	62.8
Accrued liabilities	63.5	80.9
Total current liabilities	271.9	292.6
Commitments and contingencies (see Note 13)
Long-term debt	684.4	576.5
Retirement obligations	40.0	38.6
Other non-current liabilities	159.4	100.1
Total liabilities	1,155.7	1,007.8
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 106.7 shares and 106.0 shares issued at December 31, 2016 and 2015, respectively	1.1	1.1
Additional paid-in capital	738.8	715.8
Retained earnings	1,254.7	1,044.4
Accumulated other comprehensive loss	(174.4)	(123.9)
Total stockholders' equity including treasury stock value	1,820.2	1,637.4
Less – Treasury stock, at cost, 15.3 shares and 12.5 shares at December 31, 2016 and 2015, respectively	(575.3)	(457.8)
Total stockholders' equity	1,244.9	1,179.6
Total liabilities and stockholders' equity	$ 2,400.6	$ 2,187.4