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SHORT-TERM INVESTMENTS: (Tables)

9 Months Ended

Sep. 30, 2011

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

		At September 30, 2011			At December 31, 2010
Trading securities		$	528.3		$	66.9
Weighted average interest rate		1.71		%	1.14		%
Available for sale		$	7.5		$	9.3
Weighted average interest rate		0.32		%	1.01		%
Total		$	535.8		$	76.2

Summary of activities in short-term investments

		Three months ended						Nine months ended
		September 30,						September 30,
		2011			2010			2011			2010
Trading securities:
Interest earned		$	1.2		$	0.1		$	2.9		$	0.2
Available for sale:
Interest earned		(*		)	0.1			(*		)	0.1
Investment redeemed		$	0.9		$	3.0		$	1.7		$	14.2

(*) Less than $0.1 million

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