Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 82.0	$ 103.3
Accounts receivable, net	164.4	125.4
Inventories, net	217.4	213.5
Contract assets	42.3	43.1
Prepaid expenses and other current assets	50.7	38.0
Assets held for sale	12.6	12.6
Total current assets	569.4	535.9
Property, plant and equipment	3,109.8	3,139.7
Less accumulated depreciation	(1,281.4)	(1,265.5)
Net property, plant and equipment	1,828.4	1,874.2
Goodwill and other intangible assets, net	274.4	277.8
Investments in affiliated companies	44.4	44.7
Other assets	176.9	185.2
Total assets	2,893.5	2,917.8
Current liabilities:
Short-term borrowings	0.3	0.9
Accounts payable	88.5	70.0
Accrued compensation and benefits	56.1	43.2
Financial instruments	2.8	3.6
Accrued liabilities	72.2	65.4
Total current liabilities	219.9	183.1
Long-term debt	912.0	925.5
Retirement obligations	52.2	53.9
Deferred income taxes	141.5	153.0
Other non-current liabilities	81.0	92.1
Total liabilities	1,406.6	1,407.6
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 109.9 shares and 109.7 shares issued at March 31, 2021 and December 31, 2020, respectively	1.1	1.1
Additional paid-in capital	861.5	849.7
Retained earnings	1,982.4	1,996.4
Accumulated other comprehensive loss	(78.7)	(59.6)
Total stockholders' equity including treasury stock value	2,766.3	2,787.6
Less – Treasury stock, at cost, 26.1 shares at March 31, 2021 and 26.1 shares at December 31, 2020, respectively.	(1,279.4)	(1,277.4)
Total stockholders' equity	1,486.9	1,510.2
Total liabilities and stockholders' equity	$ 2,893.5	$ 2,917.8