CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 373.6	$ 355.3
Restricted cash	1.7	2.0
Accounts and other receivables, net	338.3	323.0
Inventories, net	473.0	519.0
Prepaid expenses and other	13.6	19.0
Total current assets	1,200.2	1,218.3
Other assets:
Investment in TiO2 manufacturing joint venture	106.7	103.3
Restricted cash	4.6	4.7
Marketable securities	3.0	2.2
Operating lease right-of-use assets	24.6	26.1
Deferred income taxes	143.3	151.0
Other	7.1	6.5
Total other assets	289.3	293.8
Property and equipment:
Land	42.7	44.1
Buildings	228.0	233.9
Equipment	1,141.1	1,173.7
Mining properties	128.5	127.8
Construction in progress	59.5	56.1
Gross property and equipment	1,599.8	1,635.6
Less accumulated depreciation and amortization	1,092.7	1,111.0
Net property and equipment	507.1	524.6
Total assets	1,996.6	2,036.7
Current liabilities:
Current maturities of long-term debt	0.7	0.7
Accounts payable and accrued liabilities	238.0	243.8
Income taxes	16.5	15.7
Total current liabilities	255.2	260.2
Noncurrent liabilities:
Long-term debt	465.9	486.7
Accrued pension costs	355.8	372.6
Payable to affiliate - income taxes	50.6	50.6
Operating lease liabilities	17.6	18.8
Deferred income taxes	24.1	24.6
Other	26.5	26.7
Total noncurrent liabilities	940.5	980.0
Stockholders' equity:
Common stock	1.2	1.2
Additional paid-in capital	1,395.3	1,395.3
Retained deficit	(153.0)	(151.8)
Accumulated other comprehensive loss	(442.6)	(448.2)
Total stockholders' equity	800.9	796.5
Total liabilities and stockholders' equity	1,996.6	2,036.7
Commitments and contingencies (Notes 11 and 13)