Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 105.8	$ 103.3
Accounts receivable, net	176.6	125.4
Inventories, net	244.5	213.5
Contract assets	38.4	43.1
Prepaid expenses and other current assets	42.0	38.0
Assets held for sale	12.6	12.6
Total current assets	619.9	535.9
Property, plant and equipment	3,104.9	3,139.7
Less accumulated depreciation	(1,344.1)	(1,265.5)
Net property, plant and equipment	1,760.8	1,874.2
Goodwill and other intangible assets, net	269.9	277.8
Investments in affiliated companies	43.0	44.7
Other assets	179.0	185.2
Total assets	2,872.6	2,917.8
Current liabilities:
Short-term borrowings	0.9	0.9
Accounts payable	90.1	70.0
Accrued compensation and benefits	64.7	43.2
Financial instruments	2.4	3.6
Accrued liabilities	66.8	65.4
Total current liabilities	224.9	183.1
Long-term debt	876.4	925.5
Retirement obligations	53.2	53.9
Deferred income taxes	149.7	153.0
Other non-current liabilities	74.1	92.1
Total liabilities	1,378.3	1,407.6
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 110.0 shares and 109.7 shares issued at June 30, 2021 and December 31, 2020, respectively	1.1	1.1
Additional paid-in capital	873.4	849.7
Retained earnings	1,993.6	1,996.4
Accumulated other comprehensive loss	(93.8)	(59.6)
Total stockholders' equity including treasury stock value	2,774.3	2,787.6
Less – Treasury stock, at cost, 26.1 shares at June 30, 2021 and 26.1 shares at December 31, 2020.	(1,280.0)	(1,277.4)
Total stockholders' equity	1,494.3	1,510.2
Total liabilities and stockholders' equity	$ 2,872.6	$ 2,917.8