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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Cash Flows from Operating Activities                
Net earnings including noncontrolling interest $ 45,900,000 $ (230,300,000) $ (158,100,000) $ (100,400,000)        
Adjustments to reconcile net (loss) earnings including noncontrolling interests to net cash provided by operating activities:                
Depreciation, depletion and amortization 215,400,000 220,700,000 433,200,000 438,800,000        
Deferred and other income taxes     123,800,000 29,600,000        
Equity in net loss of nonconsolidated companies, net of dividends     (49,800,000) (14,800,000)        
Accretion expense for asset retirement obligations     34,000,000.0 28,700,000 $ 62,400,000      
Accretion Expense     13,600,000 0        
Share-based compensation expense     (1,900,000) (22,100,000)        
Unrealized loss (gain) on derivatives     (47,200,000) 45,300,000        
Foreign Currency Transaction Gain, before Tax     207,300,000 25,200,000        
Proceeds from Sale of Securities, Operating Activities     34,700,000 0        
Colonsay and Plant City Closure Costs     0 369,400,000        
Other     (10,000,000.0) (6,200,000)        
Changes in assets and liabilities, excluding effects of acquisition:                
Receivables, net     (42,800,000) (167,900,000)        
Inventories     70,600,000 413,600,000        
Other current and noncurrent assets     (55,000,000.0) 66,700,000        
Accounts payable and accrued liabilities     391,000,000.0 (57,400,000)        
Other noncurrent liabilities     39,400,000 (28,300,000)        
Net cash provided by operating activities     1,003,600,000 331,800,000        
Cash Flows from Investing Activities                
Capital expenditures 257,200,000 294,900,000 520,700,000 608,800,000        
Purchase of Assets     0 55,100,000        
Purchases of available-for-sale securities - restricted     (348,500,000) (234,200,000)        
Proceeds from sale of available-for-sale securities - restricted     341,000,000.0 221,800,000        
Payments to Acquire Held-to-maturity Securities     (700,000) (13,000,000.0)        
Proceeds from Sale of Held-to-maturity Securities     800,000 2,300,000        
Other     (500,000) 600,000        
Net cash used in investing activities     (527,600,000) (687,600,000)        
Cash Flows from Financing Activities                
Repayments of Other Short-term Debt     821,500,000 322,700,000        
Proceeds from Other Short-term Debt     1,395,000,000.0 404,500,000        
Payments of structured accounts payable arrangements     (701,600,000) (598,100,000)        
Proceeds from structured accounts payable arrangements     365,300,000 445,400,000        
Payments of long-term debt     (31,400,000) (21,400,000)        
Cash dividends paid     (37,900,000) (28,900,000)        
Payments of Ordinary Dividends, Noncontrolling Interest     (300,000) (300,000)        
Net cash provided by (used in) financing activities     167,600,000 (121,500,000)        
Effect of exchange rate changes on cash     (84,300,000) 24,300,000        
Net change in cash, cash equivalents and restricted cash     559,300,000 (453,000,000.0)        
Cash, cash equivalents and restricted cash-beginning of period     532,300,000          
Cash, cash equivalents and restricted cash-end of period 1,091,600,000 418,000,000.0 1,091,600,000 418,000,000.0 532,300,000      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]                
Effect of exchange rate changes on cash     (84,300,000) 24,300,000        
Cash and cash equivalents           $ 1,073,300,000 $ 519,100,000 $ 401,900,000
Restricted cash in other current assets           8,500,000   9,000,000.0
Restricted cash in other assets           9,800,000 5,400,000 7,100,000
Cash, cash equivalents and restricted cash-end of period $ 1,091,600,000 $ 418,000,000.0 1,091,600,000 418,000,000.0 $ 532,300,000 $ 1,091,600,000 $ 532,300,000 $ 418,000,000.0
Supplemental Disclosure of Cash Flow Information:                
Interest (net of amount capitalized)     103,300,000 102,600,000        
Income taxes (net of refunds)     $ (21,700,000) $ 103,400,000