Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 784.9	$ 955.3
Accounts receivable, net	436.0	792.6
Inventories, net of inventory valuation reserves	473.1	946.7
Other current assets	262.1	268.7
Total current assets	1,956.1	2,963.3
Property, plant and equipment:
Property, plant and equipment	3,539.8	3,362.8
Less: accumulated depreciation	(975.4)	(934.5)
Property, plant and equipment, net	2,564.4	2,428.3
Operating lease right-of-use assets	177.1	183.6
Goodwill	855.7	855.7
Other intangibles, net	111.5	110.3
Equity method investments	365.2	407.3
Other non-current assets	63.4	67.8
Total assets	6,093.4	7,016.3
Current liabilities:
Accounts payable	1,102.3	1,599.7
Current portion of long-term debt	31.4	36.4
Obligation under Supply and Offtake Agreements	97.9	332.5
Current portion of operating lease liabilities	40.6	40.5
Accrued expenses and other current liabilities	354.7	346.8
Total current liabilities	1,626.9	2,355.9
Non-current liabilities:
Long-term debt, net of current portion	2,185.5	2,030.7
Obligation Under Supply And Offtake Agreements, Noncurrent	179.5	144.8
Environmental liabilities, net of current portion	136.3	137.9
Asset retirement obligations	67.1	68.6
Deferred tax liabilities	242.2	267.9
Operating lease liabilities, net of current portion	137.3	144.3
Other non-current liabilities	28.7	30.9
Total non-current liabilities	2,976.6	2,825.1
Stockholders’ equity:
Preferred stock, $0.01 par value, 11,000,000 shares and 10,000,000 shares authorized at March 31,2020 and December 31, 2019, respectively, no shares issued and outstanding	0.0	0.0
Common stock, $0.01 par value, 110,000,000 shares authorized, 91,089,920 shares and 90,987,025 shares issued at March 31, 2020 and December 31, 2019, respectively	0.9	0.9
Additional paid-in capital	1,157.4	1,151.9
Accumulated other comprehensive income	1.2	0.1
Treasury stock, 17,575,527 shares and 17,516,814 shares, at cost, as of March 31, 2020 and December 31, 2019, respectively	(694.1)	(692.2)
Retained earnings	861.6	1,205.6
Non-controlling interests in subsidiaries	162.9	169.0
Total stockholders’ equity	1,489.9	1,835.3
Total liabilities and stockholders’ equity	$ 6,093.4	$ 7,016.3