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v3.19.1

SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Short-term investment: |  |  |
Trading securities | $ 212.7 |  | $ 213.1
Weighted average interest rate (as a percent) | 2.50% |  | 2.20%
Available-for-sale | $ 0.8 |  | $ 0.7
Weighted average interest rate (as a percent) | 0.70% |  | 0.70%
Total | $ 213.5 |  | $ 213.8
Trading: |  |  |
Interest earned | 0.1 | $ 0.1 |
Unrealized (loss) gain at the end of the period | (0.1) | (0.1) |
Available-for-sale: |  |  |
Interest earned | 3.7 | 2.6 |
Investment redeemed |  | 0.1 |
Maximum |  |  |
Available-for-sale: |  |  |
Interest earned | $ 0.1 | $ 0.1 |

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