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SHORT TERM INVESTMENTS: (Tables)

6 Months Ended

Jun. 30, 2011

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

		At June 30, 2011			At December 31, 2010
Trading securities		$	216.4		$	66.9
Weighted average interest rate		2.02		%	1.14		%
Available for sale		$	9.0		$	9.3
Weighted average interest rate		0.37		%	1.01		%
Total		$	225.4		$	76.2

Summary of activities in short-term investments

		Three months ended						Six months ended
		June 30,						June 30,
		2011			2010			2011			2010
Trading securities:
Interest earned		$	1.0		$	0.1		$	1.4		$	0.1
Available for sale:
Interest earned		(*		)	(*		)	(*		)	0.1
Investment redeemed		$	0.4		$	7.7		$	0.8		$	11.2

(*) Less than $0.1 million

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