XML 38 R25.htm IDEA: XBRL DOCUMENT

SHORT-TERM INVESTMENTS: (Tables)

9 Months Ended

Sep. 30, 2021

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

Short-term investments were as follows (in millions):


		At September 30,			At December 31,
		2021			2020
Trading securities		$	626.4		$	410.2
Weighted average interest rate			0.2	%		0.4	%

Available-for-sale		$	0.4		$	0.6
Weighted average interest rate			0.7	%		0.7	%
Total		$	626.8		$	410.8

Summary of activity investments

The following table summarizes the activity of these investments by category (in millions):


		Three months ended						Nine months ended
		September 30,						September 30,
		2021			2020			2021			2020
Trading:
Interest earned		$	0.6		$	(*)		$	1.3		$	0.1
Unrealized gain (loss) at the end of the period		$	(*)		$	(*)		$	(*)		$	(*)

Available-for-sale:
Interest earned			(*)			(*)			(*)			(*)
Investment redeemed		$	0.1		$	—		$	0.2		$	0.1

(*) Less than $0.1 million.