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SHORT-TERM INVESTMENTS: (Tables)

3 Months Ended

Mar. 31, 2012

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

		March 31,			December 31,
		2012			2011
Trading securities		$	220.0		$	514.6
Weighted average interest rate		1.33		%	1.37		%
Available for sale		7.3			7.3
Weighted average interest rate		0.52		%	0.58		%
Total		$	227.3		$	521.9

Summary of activities in short-term investments

		Three months ended  March 31,
		2012			2011
Trading:
Interest earned		$	0.8		$	0.4
Unrealized loss		$	2.6		—
Available for sale:
Interest earned		(*		)	(*		)
Investment redeemed		$	0.3		$	0.4

(*) Less than $0.1 million.

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