Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,109.1	$ 931.8
Accounts receivable, net	736.9	579.6
Accounts receivable from related parties	3.1	2.1
Inventories, net of inventory valuation reserves	923.9	808.4
Assets held for sale	0.0	160.0
Other current assets	88.4	129.9
Total current assets	2,861.4	2,611.8
Property, plant and equipment:
Property, plant and equipment	2,897.2	2,772.5
Less: accumulated depreciation	(754.8)	(631.7)
Property, plant and equipment, net	2,142.4	2,140.8
Goodwill	857.8	816.6
Other intangibles, net	105.8	101.1
Equity method investments	131.3	138.1
Other non-current assets	60.0	126.8
Total assets	6,158.7	5,935.2
Current liabilities:
Accounts payable	1,108.1	973.4
Accounts payable to related parties	2.2	1.7
Current portion of long-term debt	32.0	590.2
Obligation under Supply and Offtake Agreements	478.7	435.6
Liabilities associated with assets held for sale	0.0	105.9
Accrued expenses and other current liabilities	384.6	564.9
Total current liabilities	2,005.6	2,671.7
Non-current liabilities:
Long-term debt, net of current portion	1,830.0	875.4
Environmental liabilities, net of current portion	136.1	68.9
Asset retirement obligations	76.9	72.1
Deferred tax liabilities	175.2	199.9
Other non-current liabilities	37.8	83.0
Total non-current liabilities	2,256.0	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, 90,432,492 shares and 81,533,548 shares issued at September 30, 2018 and December 31, 2017, respectively	0.9	0.8
Additional paid-in capital	1,168.8	900.1
Accumulated other comprehensive income	6.4	6.9
Treasury stock, 8,302,905 shares and 762,623 shares, at cost, as of September 30, 2018 and December 31, 2017, respectively	(356.3)	(25.0)
Retained earnings	901.5	767.8
Non-controlling interests in subsidiaries	175.8	313.6
Total stockholders’ equity	1,897.1	1,964.2
Total liabilities and stockholders’ equity	$ 6,158.7	$ 5,935.2