Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 849.0	$ 955.3
Accounts receivable, net	480.4	792.6
Inventories, net of inventory valuation reserves	653.5	946.7
Other current assets	390.0	268.7
Total current assets	2,372.9	2,963.3
Property, plant and equipment:
Property, plant and equipment	3,514.9	3,362.8
Less: accumulated depreciation	(1,031.5)	(934.5)
Property, plant and equipment, net	2,483.4	2,428.3
Operating lease right-of-use assets	183.9	183.6
Goodwill	855.7	855.7
Other intangibles, net	110.0	110.3
Equity method investments	367.3	407.3
Other non-current assets	64.4	67.8
Total assets	6,437.6	7,016.3
Current liabilities:
Accounts payable	1,004.2	1,599.7
Current portion of long-term debt	33.4	36.4
Obligation under Supply and Offtake Agreements	99.0	332.5
Current portion of operating lease liabilities	43.4	40.5
Accrued expenses and other current liabilities	409.3	346.8
Total current liabilities	1,589.3	2,355.9
Non-current liabilities:
Long-term debt, net of current portion	2,421.5	2,030.7
Obligation Under Supply And Offtake Agreements, Noncurrent	215.0	144.8
Environmental liabilities, net of current portion	106.3	137.9
Asset retirement obligations	36.8	68.6
Deferred tax liabilities	335.4	267.9
Operating lease liabilities, net of current portion	140.2	144.3
Other non-current liabilities	33.8	30.9
Total non-current liabilities	3,289.0	2,825.1
Stockholders’ equity:
Preferred stock, $0.01 par value, 11,000,000 shares and 10,000,000 shares authorized at June 30,2020 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, 91,232,964 shares and 90,987,025 shares issued at June 30, 2020 and December 31, 2019, respectively	0.9	0.9
Additional paid-in capital	1,160.1	1,151.9
Accumulated other comprehensive income	0.5	0.1
Treasury stock, 17,575,527 shares and 17,516,814 shares, at cost, as of June 30, 2020 and December 31, 2019, respectively	(694.1)	(692.2)
Retained earnings	926.4	1,205.6
Non-controlling interests in subsidiaries	165.5	169.0
Total stockholders’ equity	1,559.3	1,835.3
Total liabilities and stockholders’ equity	$ 6,437.6	$ 7,016.3