Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 955.3	$ 1,079.3
Accounts receivable, net	792.6	514.4
Inventories, net of inventory valuation reserves	946.7	677.9
Other current assets	268.7	148.7
Total current assets	2,963.3	2,420.3
Property, plant and equipment:
Property, plant and equipment	3,362.8	2,999.6
Less: accumulated depreciation	(934.5)	(804.7)
Property, plant and equipment, net	2,428.3	2,194.9
Operating lease right-of-use assets	183.6
Goodwill	855.7	857.8
Other intangibles, net	110.3	104.4
Equity method investments	407.3	130.3
Other non-current assets	67.8	52.9
Total assets	7,016.3	5,760.6
Current liabilities:
Accounts payable	1,599.7	1,011.2
Current portion of long-term debt	36.4	32.0
Obligation under Supply and Offtake Agreements	332.5	312.6
Current portion of operating lease liabilities	40.5
Accrued expenses and other current liabilities	346.8	307.7
Total current liabilities	2,355.9	1,663.5
Non-current liabilities:
Long-term debt, net of current portion	2,030.7	1,751.3
Obligation under Supply and Offtake Agreements	144.8	49.6
Environmental liabilities, net of current portion	137.9	139.5
Asset retirement obligations	68.6	75.5
Deferred tax liabilities	267.9	210.2
Operating lease liabilities, net of current portion	144.3
Other non-current liabilities	30.9	62.9
Total non-current liabilities	2,825.1	2,289.0
Stockholders’ equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding	0.0	0.0
Common stock, $0.01 par value, 110,000,000 shares authorized, 90,987,025 shares and 90,478,075 shares issued at December 31, 2019 and December 31, 2018, respectively	0.9	0.9
Additional paid-in capital	1,151.9	1,135.4
Accumulated other comprehensive income	0.1	28.6
Treasury stock, 17,516, 814 shares and 12,477,780 shares, at cost, as of December 31, 2019 and December 31, 2018, respectively	(692.2)	(514.1)
Retained earnings	1,205.6	981.8
Non-controlling interests in subsidiaries	169.0	175.5
Total stockholders’ equity	1,835.3	1,808.1
Total liabilities and stockholders’ equity	$ 7,016.3	$ 5,760.6