Condensed Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 32.7	$ 60.1
Accounts receivable, net	260.9	248.7
Inventories	297.8	314.0
Contract assets	50.5
Prepaid expenses and other current assets	33.9	33.9
Total current assets	675.8	656.7
Property, plant and equipment	2,839.9	2,743.9
Less accumulated depreciation	(963.4)	(877.6)
Property, plant and equipment, net	1,876.5	1,866.3
Goodwill and other intangible assets	142.3	148.7
Investments in affiliated companies	48.7	47.7
Other assets	80.8	61.5
Total assets	2,824.1	2,780.9
Current liabilities:
Short-term borrowings	9.4	4.3
Accounts payable	161.9	144.1
Accrued compensation and benefits	75.8	73.0
Accrued liabilities	79.6	40.7
Total current liabilities	326.7	262.1
Commitments and contingencies (see Note 15)
Long-term debt	947.4	805.6
Retirement obligations	42.0	45.4
Other non-current liabilities	186.0	172.7
Total liabilities	1,502.1	1,285.8
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 108.5 shares and 107.8 shares issued at December 31, 2018 and 2017, respectively	1.1	1.1
Additional paid-in capital	798.3	774.3
Retained earnings	1,726.5	1,496.1
Accumulated other comprehensive loss	(108.0)	(45.0)
Total stockholders' equity including treasury stock value	2,417.9	2,226.5
Less – Treasury stock, at cost, 23.7 shares and 18.2 shares at December 31, 2018 and 2017, respectively	(1,095.9)	(731.4)
Total stockholders' equity	1,322.0	1,495.1
Total liabilities and stockholders' equity	$ 2,824.1	$ 2,780.9