Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 329.3	$ 64.4
Accounts receivable, net	266.7	227.6
Inventories, net	354.4	333.1
Contract assets	55.9	52.7
Prepaid expenses and other current assets	34.0	27.1
Total current assets	1,040.3	704.9
Property, plant and equipment	3,071.5	3,075.1
Less accumulated depreciation	(1,156.0)	(1,132.3)
Net property, plant and equipment	1,915.5	1,942.8
Goodwill and other intangible assets, net	276.6	280.4
Investments in affiliated companies	47.9	46.5
Other assets	153.0	154.0
Total assets	3,433.3	3,128.6
Current liabilities:
Short-term borrowings	0.6	9.5
Accounts payable	151.9	157.6
Accrued compensation and benefits	50.7	74.4
Accrued liabilities	106.7	81.1
Total current liabilities	309.9	322.6
Commitments and contingencies (see Note 12)
Long-term debt	1,389.5	1,050.6
Retirement obligations	53.1	53.3
Other non-current liabilities	259.7	256.0
Total liabilities	2,012.2	1,682.5
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 109.5 shares and 109.3 shares issued at March 31, 2020 and December 31, 2019, respectively	1.1	1.1
Additional paid-in capital	845.1	829.9
Retained earnings	2,007.1	1,978.9
Accumulated other comprehensive loss	(155.3)	(118.7)
Total stockholders' equity including treasury stock value	2,698.0	2,691.2
Less – Treasury stock, at cost, 26.1 shares at March 31, 2020 and 25.7 shares at December 31, 2019, respectively.	(1,276.9)	(1,245.1)
Total stockholders' equity	1,421.1	1,446.1
Total liabilities and stockholders' equity	$ 3,433.3	$ 3,128.6