Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash provided by operating activities:
Net income	$ 112.0	$ 95.7
Non-cash charges to net income:
Depreciation and amortization	49	54
Changes in working capital:
Accounts receivable and prepaid items	(75)	(22)
Inventories	(80)	(42)
Accounts payable and accrued liabilities	(67)	(58)
Increase in margin accounts		(32)
Other	31	33
Cash (used for) provided by operating activities	(30)	29
Cash used for investing activities:
Capital expenditures, net of proceeds on disposals	(66)	(59)
Short-term investments	19
Other	2
Cash used for investing activities	(45)	(59)
Cash used for financing activities:
Proceeds from borrowings	17	17
Payments on debt	(6)	(49)
Issuance of common stock	8	8
Dividends paid (including to non-controlling interests)	(22)	(17)
Excess tax benefit on share-based compensation		1
Cash used for financing activities	(3)	(40)
Effect of foreign exchange rate changes on cash	(5)	4
Decrease in cash and cash equivalents	(83)	(66)
Cash and cash equivalents, beginning of period	609	401
Cash and cash equivalents, end of period	$ 526	$ 335