Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 68.0	$ 64.4
Accounts receivable, net	149.9	227.6
Inventories, net	262.9	333.1
Contract assets	48.9	52.7
Prepaid expenses and other current assets	46.1	27.1
Total current assets	575.8	704.9
Property, plant and equipment	3,103.3	3,075.1
Less accumulated depreciation	(1,226.0)	(1,132.3)
Net property, plant and equipment	1,877.3	1,942.8
Goodwill and other intangible assets, net	276.6	280.4
Investments in affiliated companies	45.7	46.5
Other assets	196.7	154.0
Total assets	2,972.1	3,128.6
Current liabilities:
Short-term borrowings	0.5	9.5
Accounts payable	61.1	157.6
Accrued compensation and benefits	48.3	74.4
Accrued liabilities	65.6	81.1
Total current liabilities	175.5	322.6
Commitments and contingencies (see Note 12)
Long-term debt	998.7	1,050.6
Retirement obligations	55.5	53.3
Other non-current liabilities	243.0	256.0
Total liabilities	1,472.7	1,682.5
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 109.6 shares and 109.3 shares issued at September 30, 2020 and December 31, 2019, respectively	1.1	1.1
Additional paid-in capital	845.1	829.9
Retained earnings	2,015.8	1,978.9
Accumulated other comprehensive loss	(85.2)	(118.7)
Total stockholders' equity including treasury stock value	2,776.8	2,691.2
Less – Treasury stock, at cost, 26.1 shares at September 30, 2020 and 25.7 shares at December 31, 2019, respectively.	(1,277.4)	(1,245.1)
Total stockholders' equity	1,499.4	1,446.1
Total liabilities and stockholders' equity	$ 2,972.1	$ 3,128.6