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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
OPERATING ACTIVITIES        
Net income $ 402.8 $ 198.2 $ 1,018.6 $ 606.5
Adjustments to reconcile net income to net cash provided from operating activities:        
Depreciation, amortization and depletion 169.3 174.5 493.8 474.3
Equity earnings of affiliate, net of dividends received (4.3) (5.3) (8.3) (7.5)
(Gain) loss on foreign currency transaction effect (2.0) 1.6 50.8 (6.5)
Benefit (provision) for deferred income taxes (20.9) (77.1) (61.7) (130.9)
Other, net 3.6 7.6 11.2 21.4
Change in operating assets and liabilities:        
Decrease (increase) in accounts receivable (210.1) (86.5) (238.3) (115.0)
Decrease (increase) in inventories (72.3) (3.4) (120.5) (149.7)
Increase (decrease) in accounts payable and accrued liabilities 113.9 153.1 (9.5) 53.6
Decrease (increase) in other operating assets and liabilities 56.1 (55.6) 143.9 (110.3)
Net cash provided by operating activities 436.1 307.1 1,280.0 635.9
INVESTING ACTIVITIES        
Capital investments (212.7) (275.6) (710.4) (840.5)
Proceeds from sale (purchase) of short-term investments, net 9.6 (2.6) 20.8 502.7
Loan repaid by related parties   74.8   111.2
Sale of property   1.3 1.0 2.6
Sale of property (0.1)      
Net cash used in investing activities (203.2) (202.1) (688.6) (224.0)
FINANCING ACTIVITIES        
Cash dividends paid to common stockholders (108.2) (38.7) (262.8) (100.6)
Repurchase of common shares   (18.0)   (71.7)
Other (0.2)   0.1 0.3
Net cash used in financing activities (108.4) (56.7) (262.7) (172.0)
Effect of exchange rate changes on cash and cash equivalents (14.7) 10.7 (76.2) (2.9)
Increase in cash and cash equivalents 109.8 59.0 252.5 237.0
Cash and cash equivalents, at beginning of period 688.7 452.5 546.0 274.5
Cash and cash equivalents, at end of period $ 798.5 $ 511.5 $ 798.5 $ 511.5