Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,079.3	$ 931.8
Accounts receivable, net	514.4	579.6
Accounts receivable from related parties	0.0	2.1
Inventories, net of inventory valuation reserves	690.9	808.4
Assets held for sale	0.0	160.0
Other current assets	135.7	129.9
Total current assets	2,420.3	2,611.8
Property, plant and equipment:
Property, plant and equipment	2,999.6	2,772.5
Less: accumulated depreciation	(804.7)	(631.7)
Property, plant and equipment, net	2,194.9	2,140.8
Goodwill	857.8	816.6
Other intangibles, net	104.4	101.1
Equity method investments	130.3	138.1
Other non-current assets	52.9	126.8
Total assets	5,760.6	5,935.2	[1]
Current liabilities:
Accounts payable	1,009.7	973.4
Accounts payable to related parties	1.5	1.7
Current portion of long-term debt	32.0	590.2
Obligation under Supply and Offtake Agreements	312.6	435.6
Liabilities associated with assets held for sale	0.0	105.9
Accrued expenses and other current liabilities	307.7	564.9
Total current liabilities	1,663.5	2,671.7
Non-current liabilities:
Long-term debt, net of current portion	1,751.3	875.4
Obligation under Supply and Offtake Agreements	49.6	0.0
Environmental liabilities, net of current portion	139.5	68.9
Asset retirement obligations	75.5	72.1
Deferred tax liabilities	210.2	199.9
Other non-current liabilities	62.9	83.0
Total non-current liabilities	2,289.0	1,299.3
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, 90,478,075 shares and 81,533,548 shares issued at December 31, 2018 and 2017, respectively	0.9	0.8
Additional paid-in capital	1,135.4	900.1
Accumulated other comprehensive income	28.6	6.9
Treasury stock, 12,477,780 shares and 762,623 shares, at cost, as of December 31, 2018 and 2017, respectively	(514.1)	(25.0)
Retained earnings	981.8	767.8
Non-controlling interests in subsidiaries	175.5	313.6
Total stockholders’ equity	1,808.1	1,964.2
Total liabilities and stockholders’ equity	$ 5,760.6	$ 5,935.2

[1] Assets held for sale of $160.0 million are included in the corporate, other and eliminations segment as of December 31, 2017.