Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 591.4	$ 689.2
Accounts receivable	325.8	265.9
Accounts receivable from related party	1.5	0.1
Inventories, net of inventory valuation reserves	397.4	392.4
Other current assets	51.2	49.3
Total current assets	1,367.3	1,396.9
Property, plant and equipment:
Property, plant and equipment	1,602.7	1,587.6
Less: accumulated depreciation	(512.9)	(484.3)
Property, plant and equipment, net	1,089.8	1,103.3
Goodwill	12.2	12.2
Other intangibles, net	26.3	26.7
Equity method investments	360.0	360.0
Other non-current assets	102.4	80.7
Total assets	2,958.0	2,979.8
Current liabilities:
Accounts payable	503.6	494.6
Accounts payable to related party	2.9	1.8
Current portion of long-term debt	84.4	84.4
Obligation under Supply and Offtake Agreement	130.2	124.6
Accrued expenses and other current liabilities	197.8	229.8
Total current liabilities	918.9	935.2
Non-current liabilities:
Long-term debt, net of current portion	740.5	748.5
Environmental liabilities, net of current portion	6.0	6.2
Asset retirement obligations	5.3	5.2
Deferred tax liabilities	75.7	76.2
Other non-current liabilities	29.2	26.0
Total non-current liabilities	856.7	862.1
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, 67,224,463 shares and 67,150,352 shares issued at March 31, 2017 and December 31, 2016, respectively	0.7	0.7
Additional paid-in capital	653.6	650.5
Accumulated other comprehensive loss	(19.5)	(20.8)
Treasury stock, 5,195,791 shares, at cost, as of both March 31, 2017 and December 31, 2016	(160.8)	(160.8)
Retained earnings	523.9	522.3
Non-controlling interest in subsidiaries	184.5	190.6
Total stockholders’ equity	1,182.4	1,182.5
Total liabilities and stockholders’ equity	$ 2,958.0	$ 2,979.8