Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 43.7	$ 32.7
Accounts receivable, net	324.3	260.9
Inventories, net	334.5	297.8
Contract assets	53.7	50.5
Prepaid expenses and other current assets	26.1	33.9
Total current assets	782.3	675.8
Property, plant and equipment	2,894.5	2,839.9
Less accumulated depreciation	(991.8)	(963.4)
Net property, plant and equipment	1,902.7	1,876.5
Goodwill and other intangible assets	286.2	142.3
Investments in affiliated companies	50.9	48.7
Other assets	143.9	80.8
Total assets	3,166.0	2,824.1
Current liabilities:
Short-term borrowings	9.7	9.4
Accounts payable	165.2	161.9
Accrued compensation and benefits	62.1	75.8
Accrued liabilities	112.9	79.6
Total current liabilities	349.9	326.7
Commitments and contingencies (see Note 14)
Long-term debt	1,160.0	947.4
Retirement obligations	42.1	42.0
Other non-current liabilities	241.6	186.0
Total liabilities	1,793.6	1,502.1
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 108.8 shares and 108.5 shares issued at March 31, 2019 and December 31, 2018, respectively	1.1	1.1
Additional paid-in capital	811.8	798.3
Retained earnings	1,786.0	1,726.5
Accumulated other comprehensive loss	(113.9)	(108.0)
Total stockholders' equity including treasury stock value	2,485.0	2,417.9
Less – Treasury stock, at cost, 24.0 shares at March 31, 2019, and 23.7 shares at December 31, 2018, respectively.	(1,112.6)	(1,095.9)
Total stockholders' equity	1,372.4	1,322.0
Total liabilities and stockholders' equity	$ 3,166.0	$ 2,824.1