Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 257.2	$ 64.4
Accounts receivable, net	191.6	227.6
Inventories, net	316.6	333.1
Contract assets	54.7	52.7
Prepaid expenses and other current assets	29.5	27.1
Total current assets	849.6	704.9
Property, plant and equipment	3,094.9	3,075.1
Less accumulated depreciation	(1,193.1)	(1,132.3)
Net property, plant and equipment	1,901.8	1,942.8
Goodwill and other intangible assets, net	275.6	280.4
Investments in affiliated companies	45.0	46.5
Other assets	150.5	154.0
Total assets	3,222.5	3,128.6
Current liabilities:
Short-term borrowings	0.5	9.5
Accounts payable	73.2	157.6
Accrued compensation and benefits	48.6	74.4
Accrued liabilities	97.6	81.1
Total current liabilities	219.9	322.6
Commitments and contingencies (see Note 12)
Long-term debt	1,264.7	1,050.6
Retirement obligations	54.1	53.3
Other non-current liabilities	246.9	256.0
Total liabilities	1,785.6	1,682.5
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 109.6 shares and 109.3 shares issued at June 30, 2020 and December 31, 2019, respectively	1.1	1.1
Additional paid-in capital	844.6	829.9
Retained earnings	2,006.1	1,978.9
Accumulated other comprehensive loss	(138.0)	(118.7)
Total stockholders' equity including treasury stock value	2,713.8	2,691.2
Less – Treasury stock, at cost, 26.1 shares at June 30, 2020 and 25.7 shares at December 31, 2019, respectively.	(1,276.9)	(1,245.1)
Total stockholders' equity	1,436.9	1,446.1
Total liabilities and stockholders' equity	$ 3,222.5	$ 3,128.6