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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
OPERATING ACTIVITIES    
Net income $ 185.7 $ 283.7
Adjustments to reconcile net income to net cash provided from operating activities:    
Depreciation, amortization and depletion 135.3 117.0
Equity earnings of affiliate, net of dividends received (1.7) (0.5)
(Gain) loss on foreign currency transaction effect (1.1) (11.0)
(Benefit) provision for deferred income taxes (22.0) (24.7)
Other, net 6.8 (0.7)
Change in operating assets and liabilities:    
Decrease (increase) in accounts receivable (71.8) 39.1
(Increase) decrease in inventories (91.8) (54.7)
Increase (decrease) in accounts payable and accrued liabilities 19.9 (153.1)
Increase (decrease) in other operating assets and liabilities (95.2) 29.3
Net cash provided by operating activities 64.1 224.4
INVESTING ACTIVITIES    
Capital expenditures (223.3) (248.7)
Proceeds from (purchase of) short-term investments, net 320.8 254.7
Sale of property 0.8  
Net cash provided by investing activities 98.3 6.0
FINANCING ACTIVITIES    
Debt incurred   50.0
Cash dividends paid to common stockholders (23.2) (80.5)
Repurchase of common shares (53.7) (370.1)
Distributions to non-controlling interest   (0.2)
Net cash used in financing activities (76.9) (400.8)
Effect of exchange rate changes on cash and cash equivalents 16.0 (1.5)
Net increase (decrease) in cash and cash equivalents 101.5 (171.9)
Cash and cash equivalents at beginning of period 274.5 364.0
Cash and cash equivalents at end of period $ 376.0 $ 192.1