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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Investments |  |
Trading securities | $ 600.2 | $ 333.7
Weighted average interest rate (as a percent) | 0.71% | 0.78%
Available-for-sale | $ 3.3 | $ 4.9
Weighted average interest rate (as a percent) | 0.72% | 0.44%
Total short-term investments | $ 603.5 | $ 338.6
Trading: |  |
Interest earned | 1.5 | 4.3
Unrealized gain (loss) at the end of the period | (0.1) | 2.1
Available-for-sale |  |
Investment redeemed | 1.6 | 0.8
Contractual maturities of available-for-sale debt securities |  |
One year or less | 0.2 | 0.3
Maturing after five years through ten years |  | 0.1
Due after 10 years | 3.1 | 4.5
Total debt securities | 3.3 | 4.9
Maximum |  |
Available-for-sale |  |
Interest earned | $ 0.1 | $ 0.1

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