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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities:      
Net earnings (loss) $ 428.0 $ 450.0 $ (158.0)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:      
Depreciation and amortization 888.0 883.0 678.0
Deferred income taxes 78.0 (601.0) 739.0
Stock-based compensation expense 22.0 17.0 19.0
Unrealized net (gain) loss on natural gas derivatives (13.0) 61.0 (260.0)
Loss on Embedded Derivative Instrument 1.0 4.0 23.0
Impairment of equity method investment in PLNL 0.0 0.0 134.0
Gain on sale of equity method investment 0.0 (14.0) 0.0
Loss on debt extinguishment 0.0 53.0 167.0
Loss on disposal of property, plant and equipment 6.0 3.0 10.0
Undistributed (earnings) losses of affiliates—net of taxes (3.0) 3.0 9.0
Changes in:      
Accounts receivable—net 68.0 (57.0) 18.0
Inventories (52.0) 40.0 (7.0)
Accrued and prepaid income taxes 8.0 809.0 (676.0)
Accounts payable and accrued expenses 44.0 (1.0) (18.0)
Customer advances 59.0 48.0 (120.0)
Other—net (37.0) (67.0) 59.0
Net cash provided by operating activities 1,497.0 1,631.0 617.0
Investing Activities:      
Additions to property, plant and equipment (422.0) (473.0) (2,211.0)
Proceeds from sale of property, plant and equipment 26.0 20.0 14.0
Proceeds from sale of equity method investment 0.0 16.0 0.0
Proceeds from sale of auction rate securities 0.0 9.0 0.0
Distributions received from unconsolidated affiliates 10.0 14.0 0.0
Proceeds from Insurance Settlement, Investing Activities 10.0 0.0 0.0
Other—net 1.0 1.0 2.0
Net cash used in investing activities (375.0) (413.0) (2,195.0)
Financing Activities:      
Proceeds from long-term borrowings 0.0 0.0 1,244.0
Payments of long-term borrowings 0.0 (1,148.0) (1,170.0)
Proceeds from short-term borrowings 0.0 0.0 150.0
Payments of short-term borrowings 0.0 0.0 (150.0)
Payment to CHS related to credit provision (5.0) (5.0) (5.0)
Financing fees 1.0 (1.0) (31.0)
Purchases of treasury stock (467.0) 0.0 0.0
Dividends paid on common stock (280.0) (280.0) (280.0)
Acquisition of noncontrolling interests in TNCLP (388.0) 0.0 0.0
Issuance of noncontrolling interest in CFN 0.0 0.0 2,800.0
Distributions to noncontrolling interests (139.0) (131.0) (119.0)
Issuances of common stock under employee stock plans 12.0 1.0 0.0
Shares withheld for taxes (4.0) 0.0 0.0
Net cash (used in) provided by financing activities (1,270.0) (1,564.0) 2,439.0
Effect of exchange rate changes on cash and cash equivalents (5.0) 12.0 (1.0)
(Decrease) increase in cash, cash equivalents and restricted cash (153.0) (334.0) 860.0
Cash, cash equivalents and restricted cash at beginning of period 835.0 1,169.0 309.0
Cash, cash equivalents and restricted cash at end of period $ 682.0 $ 835.0 $ 1,169.0