CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 114.1	$ 50.7
Restricted cash	1.3	1.6
Accounts and other receivables	334.8	244.6
Inventories, net	341.8	343.5
Prepaid expenses and other	8.0	10.0
Total current assets	800.0	650.4
Other assets:
Investment in TiO2 manufacturing joint venture	70.5	78.9
Marketable securities	5.2	6.0
Deferred income taxes	127.8	8.1
Other	3.0	2.2
Total other assets	206.5	95.2
Property and equipment:
Land	40.0	37.3
Buildings	210.3	195.8
Equipment	1,031.5	947.4
Mining properties	112.5	108.1
Construction in progress	47.5	38.7
Gross property and equipment	1,441.8	1,327.3
Less accumulated depreciation and amortization	975.4	893.3
Net property and equipment	466.4	434.0
Total assets	1,472.9	1,179.6
Current liabilities:
Current maturities of long-term debt	3.6	3.6
Accounts payable and accrued liabilities	195.9	173.5
Income taxes	11.4	5.0
Total current liabilities	210.9	182.1
Noncurrent liabilities:
Long-term debt	350.8	335.4
Accrued pension cost	246.0	227.3
Accrued postretirement benefits cost	7.1	6.9
Deferred income taxes	8.6	10.5
Other	28.7	22.4
Total noncurrent liabilities	641.2	602.5
Stockholders' equity:
Common stock	1.2	1.2
Additional paid-in capital	1,399.0	1,398.8
Retained deficit	(353.7)	(552.2)
Accumulated other comprehensive loss	(425.7)	(452.8)
Total stockholders' equity	620.8	395.0
Total liabilities and stockholders' equity	1,472.9	1,179.6
Commitments and contingencies (Notes 11 and 13)