Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 115.3	$ 103.3
Accounts receivable, net	168.7	125.4
Inventories, net	232.4	213.5
Contract assets	40.5	43.1
Prepaid expenses and other current assets	49.8	38.0
Assets held for sale	12.6	12.6
Total current assets	619.3	535.9
Property, plant and equipment	3,122.3	3,139.7
Less accumulated depreciation	(1,321.3)	(1,265.5)
Net property, plant and equipment	1,801.0	1,874.2
Goodwill and other intangible assets, net	273.2	277.8
Investments in affiliated companies	43.4	44.7
Other assets	180.5	185.2
Total assets	2,917.4	2,917.8
Current liabilities:
Short-term borrowings	0.9	0.9
Accounts payable	86.8	70.0
Accrued compensation and benefits	65.1	43.2
Financial instruments	1.1	3.6
Accrued liabilities	81.7	65.4
Total current liabilities	235.6	183.1
Long-term debt	904.5	925.5
Retirement obligations	52.4	53.9
Deferred income taxes	143.1	153.0
Other non-current liabilities	79.0	92.1
Total liabilities	1,414.6	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	869.7	849.7
Retained earnings	1,984.6	1,996.4
Accumulated other comprehensive loss	(73.2)	(59.6)
Total stockholders' equity including treasury stock value	2,782.2	2,787.6
Less – Treasury stock, at cost, 26.1 shares at June 30, 2021 and 26.1 shares at December 31, 2020.	(1,279.4)	(1,277.4)
Total stockholders' equity	1,502.8	1,510.2
Total liabilities and stockholders' equity	$ 2,917.4	$ 2,917.8