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v3.20.4

SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Short-term investment: |  |  |
Trading securities | $ 410.2 | $ 80.0 |
Weighted average interest rate (as a percent) | 0.40% | 2.00% |
Available-for-sale | $ 0.6 | $ 0.7 |
Weighted average interest rate (as a percent) | 0.70% | 0.70% |
Total | $ 410.8 | $ 80.7 |
Trading: |  |  |
Interest earned | 0.7 | 0.6 |
Available-for-sale: |  |  |
Interest earned | 19.2 | 21.2 | $ 16.0
Investment redeemed | 0.1 |  |
Contractual maturities of available-for-sale debt securities |  |  |
Due after 10 years | 0.6 | 0.7 |
Total debt securities | 0.6 | 0.7 |
Maximum |  |  |
Available-for-sale: |  |  |
Interest earned | $ 0.1 | $ 0.1 |

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