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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities      
Net earnings (loss) including noncontrolling interest $ 469.9 $ (104.2) $ 301.2
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]      
Depreciation, depletion and amortization 883.9 665.5 711.2
Business Combination, Inventory Acquired, Amortization of Fair Value Adjustment (49.2) 0.0 0.0
Deferred and other income taxes (101.8) 612.4 (182.6)
Equity in net loss of nonconsolidated companies, net of dividends 12.9 34.4 32.6
Accretion expense for asset retirement obligations 48.0 25.7 40.4
Share-based compensation expense 27.5 28.0 30.5
Loss on write-down of long-lived asset 0.0 0.0 43.5
Unrealized loss (gain) on derivatives 58.9 8.3 (70.1)
Loss (gain) on disposal of fixed assets 63.1 (25.5) 27.0
Other 18.3 7.8 18.2
Changes in assets and liabilities, net of acquisitions:      
Receivables, net 5.9 (91.2) 3.5
Inventories, net (497.4) (155.7) 263.0
Other current assets and noncurrent assets 86.7 (23.7) 239.8
Accounts payable and accrued liabilities 342.0 (65.7) (243.9)
Other noncurrent liabilities 41.1 19.4 45.9
Net cash provided by operating activities 1,409.8 935.5 1,260.2
Cash Flows from Investing Activities      
Capital expenditures (954.5) (820.1) (843.1)
Purchases of available-for-sale securities - restricted (534.5) (1,676.3) (1,659.4)
Proceeds from sale of available-for-sale securities - restricted 518.8 1,658.1 1,029.3
Proceeds from sale of assets 12.6 300.7 0.9
Payments to Acquire Businesses, Gross (985.3) 0.0 0.0
Investments in nonconsolidated companies 0.0 (62.5) (244.0)
Investments in consolidated affiliate (1.5) (49.5) (169.0)
Other (0.3) (18.2) 19.3
Net cash used in investing activities (1,944.7) (667.8) (1,866.0)
Cash Flows from Financing Activities      
Payments of short-term debt (144.4) (601.4) (421.3)
Proceeds from issuance of short-term debt 155.1 631.4 397.0
Payments of structured accounts payable arrangements (762.1) (418.5) (792.2)
Proceeds from structured accounts payable arrangements 834.1 666.8 433.6
Payments of long-term debt (802.9) (102.2) (769.1)
Proceeds from issuance of long-term debt 39.3 1,251.4 720.0
Payments of Financing Costs 0.0 (15.4) 0.0
Repurchases of stock 0.0 0.0 (75.0)
Cash dividends paid (38.5) (210.6) (385.1)
Other (5.4) (0.7) 3.5
Net cash (used in) provided by financing activities (724.8) 1,200.8 (888.6)
Effect of exchange rate changes on cash (63.7) 14.5 68.8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (1,323.4) 1,483.0 (1,425.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents - Beginning of Period 2,194.4 711.4 2,137.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents - End of Period 871.0 2,194.4 711.4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]      
Cash and cash equivalents 847.7 2,153.5 673.1
Restricted cash in other current assets 7.5 8.3 7.0
Restricted cash in other assets 15.8 32.6 31.3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents - End of Period $ 871.0 $ 2,194.4 $ 711.4