Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 103.3	$ 64.4
Accounts receivable, net	125.4	227.6
Inventories	213.5	333.1
Contract assets	43.1	52.7
Prepaid expenses and other current assets	38.0	27.1
Assets held for sale	12.6
Total current assets	535.9	704.9
Property, plant and equipment	3,139.7	3,075.1
Less accumulated depreciation	(1,265.5)	(1,132.3)
Property, plant and equipment, net	1,874.2	1,942.8
Goodwill and other intangible assets	277.8	280.4
Investments in affiliated companies	44.7	46.5
Other assets	185.2	154.0
Total assets	2,917.8	3,128.6
Current liabilities:
Short-term borrowings	0.9	9.5
Accounts payable	70.0	157.6
Accrued compensation and benefits	43.2	74.4
Financial instruments	3.6	17.7
Accrued liabilities	65.4	63.4
Total current liabilities	183.1	322.6
Long-term debt	925.5	1,050.6
Retirement obligations	53.9	53.3
Deferred income taxes	153.0	155.7
Other non-current liabilities	92.1	100.3
Total liabilities	1,407.6	1,682.5
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 109.7 shares and 109.3 shares issued at December 31, 2020 and 2019, respectively	1.1	1.1
Additional paid-in capital	849.7	829.9
Retained earnings	1,996.4	1,978.9
Accumulated other comprehensive loss	(59.6)	(118.7)
Total stockholders' equity including treasury stock value	2,787.6	2,691.2
Less – Treasury stock, at cost, 26.1 shares and 25.7 shares at December 31, 2020 and 2019, respectively	(1,277.4)	(1,245.1)
Total stockholders' equity	1,510.2	1,446.1
Total liabilities and stockholders' equity	$ 2,917.8	$ 3,128.6