CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 300.5	$ 222.5	$ 615.7	$ 408.3
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation, amortization and depletion	171.2	164.5	324.6	299.8
Equity earnings of affiliate, net of dividends received	(1.2)	(0.5)	(4.0)	(2.2)
Gain (loss) on foreign currency transaction effect	21.7	(7.1)	52.8	(8.1)
Benefit for deferred income taxes	(24.0)	(31.9)	(40.6)	(53.8)
Other, net	1.2	7.1	7.6	13.8
Change in operating assets and liabilities:
Decrease (increase) in accounts receivable	49.5	43.3	(28.2)	(28.5)
Increase in inventories	(37.6)	(54.4)	(48.3)	(146.3)
Decrease in accounts payable and accrued liabilities	(195.1)	(119.5)	(123.4)	(99.5)
Decrease (increase) in other operating assets and liabilities	67.6	40.6	87.7	(54.7)
Net cash provided by operating activities	353.8	264.6	843.9	328.8
INVESTING ACTIVITIES
Capital investments	(252.1)	(341.6)	(497.7)	(564.9)
Proceeds from sale of short-term investments, net	12.6	184.5	11.2	505.3
Loan repaid by related parties		36.4		36.4
Sale of property	0.7	0.4	1.1	1.2
Net cash used in investing activities	(238.8)	(120.3)	(485.4)	(22.0)
FINANCING ACTIVITIES
Cash dividends paid to common stockholders	(92.8)	(38.7)	(154.6)	(61.9)
Repurchase of common shares				(53.7)
Other	0.3	0.3	0.3	0.3
Net cash used in financing activities	(92.5)	(38.4)	(154.3)	(115.3)
Effect of exchange rate changes on cash and cash equivalents	(32.5)	(29.4)	(61.5)	(13.5)
(Decrease) increase in cash and cash equivalents	(10.0)	76.5	142.7	178.0
Cash and cash equivalents, at beginning of period	698.7	376.0	546.0	274.5
Cash and cash equivalents, at end of period	$ 688.7	$ 452.5	$ 688.7	$ 452.5