Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 47.0	$ 32.7
Accounts receivable, net	288.9	260.9
Inventories, net	352.2	297.8
Contract assets	56.4	50.5
Prepaid expenses and other current assets	27.1	33.9
Total current assets	771.6	675.8
Property, plant and equipment	3,014.5	2,902.1
Less accumulated depreciation	(1,090.8)	(1,025.6)
Net property, plant and equipment	1,923.7	1,876.5
Goodwill and other intangible assets	279.4	142.3
Investments in affiliated companies	45.8	48.7
Other assets	134.7	80.8
Total assets	3,155.2	2,824.1
Current liabilities:
Short-term borrowings	9.3	9.4
Accounts payable	164.5	161.9
Accrued compensation and benefits	70.6	75.8
Accrued liabilities	102.6	79.6
Total current liabilities	347.0	326.7
Commitments and contingencies (see Note 14)
Long-term debt	1,115.2	947.4
Retirement obligations	41.9	42.0
Other non-current liabilities	233.3	186.0
Total liabilities	1,737.4	1,502.1
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 109.3 shares and 108.5 shares issued at September 30, 2019 and December 31, 2018, respectively	1.1	1.1
Additional paid-in capital	826.7	798.3
Retained earnings	1,920.0	1,726.5
Accumulated other comprehensive loss	(161.1)	(108.0)
Total stockholders' equity including treasury stock value	2,586.7	2,417.9
Less – Treasury stock, at cost, 24.7 shares at September 30, 2019, and 23.7 shares at December 31, 2018, respectively.	(1,168.9)	(1,095.9)
Total stockholders' equity	1,417.8	1,322.0
Total liabilities and stockholders' equity	$ 3,155.2	$ 2,824.1