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SHORT-TERM INVESTMENTS: (Tables)

6 Months Ended

Jun. 30, 2012

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

		At June 30, 2012			At December 31, 2011
Trading securities		$	367.3		$	514.6
Weighted average interest rate		1.01		%	1.37		%
Available for sale		$	6.4		$	7.3
Weighted average interest rate		0.54		%	0.58		%
Total		$	373.7		$	521.9

Summary of activities in short-term investments

		Three months ended						Six months ended
		June 30,						June 30,
		2012			2011			2012			2011
Trading securities:
Interest earned		$	0.9		$	1.0		$	1.6		$	1.4
Unrealized gain (loss)		0.1			(3.3		)	5.1			(0.9		)
Available for sale:
Interest earned		(*		)	(*		)	(*		)	(*		)
Investment redeemed		$	0.9		$	0.4		$	1.2		$	0.8

(*) Less than $0.1 million

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