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SHORT-TERM INVESTMENTS: (Tables)

9 Months Ended

Sep. 30, 2012

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

		At September 30, 2012			At December 31, 2011
Trading securities		$	373.0		$	514.6
Weighted average interest rate		1.00		%	1.37		%
Available for sale		$	6.7		$	7.3
Weighted average interest rate		0.51		%	0.58		%
Total		$	379.7		$	521.9

Summary of activities in short-term investments

		Three months ended						Nine months ended
		September 30,						September 30,
		2012			2011			2012			2011
Trading securities:
Interest earned		$	0.9		$	1.2		$	2.5		$	2.9
Unrealized gain (loss)		3.7			(1.1		)	8.8			(1.9		)
Available for sale:
Interest earned		(*)			(*)			(*)			(*)
Investment redeemed		$	0.2		$	0.9		$	1.4		$	1.7

(*) Less than $0.1 million

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