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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES    
Net income $ 315.3 $ 185.7
Adjustments to reconcile net income to net cash provided from operating activities:    
Depreciation, amortization and depletion 153.4 135.3
Equity earnings of affiliate, net of dividends received (2.8) (1.7)
Loss (gain) on foreign currency transaction effect 31.1 (1.1)
(Benefit) for deferred income taxes (16.8) (22.0)
Other, net 6.5 6.8
Change in operating assets and liabilities:    
(Increase) in accounts receivable (77.7) (71.8)
(Increase) in inventories (10.7) (91.8)
Increase in accounts payable and accrued liabilities 71.7 19.9
Increase (decrease) in other operating assets and liabilities 20.1 (95.2)
Net cash provided by operating activities 490.1 64.1
INVESTING ACTIVITIES    
Capital investments (245.6) (223.3)
(Purchase of) proceeds from short-term investments, net (1.4) 320.8
Sale of property 0.4 0.8
Net cash (used in) provided by investing activities (246.6) 98.3
FINANCING ACTIVITIES    
Cash dividends paid to common stockholders (61.8) (23.2)
Repurchase of common shares   (53.7)
Net cash used in financing activities (61.8) (76.9)
Effect of exchange rate changes on cash and cash equivalents (29.0) 16.0
Net increase in cash and cash equivalents 152.7 101.5
Cash and cash equivalents at beginning of period 546.0 274.5
Cash and cash equivalents at end of period $ 698.7 $ 376.0