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v3.19.3.a.u2

SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term investment: |  |  |
Trading securities | $ 80.0 | $ 213.1 |
Weighted average interest rate (as a percent) | 2.00% | 2.20% |
Available-for-sale | $ 0.7 | $ 0.7 |
Weighted average interest rate (as a percent) | 0.70% | 0.70% |
Total | $ 80.7 | $ 213.8 |
Trading: |  |  |
Interest earned | 0.6 | 0.5 |
Unrealized gain (loss) at the end of the period |  | (0.2) |
Available-for-sale: |  |  |
Interest earned | 21.2 | 16.0 | $ 5.5
Investment redeemed |  | 0.3 |
Contractual maturities of available-for-sale debt securities |  |  |
Due after 10 years | 0.7 | 0.7 |
Total debt securities | 0.7 | 0.7 |
Maximum |  |  |
Available-for-sale: |  |  |
Interest earned | $ 0.1 | $ 0.1 |

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