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Fair Value of Financial Instruments - Time and Call Deposits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Investments in time and call deposits |  |  |  |  |
Cash equivalents | $ 0.0 |  | $ 0.0 |  |
Short-term investments | 162.8 |  | 162.8 |  | $ 201.2
Unrealized gains (losses) on available-for-sale securities | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Minimum |  |  |  |  |
Investments in time and call deposits |  |  |  |  |
Maturity of time deposits |  |  | 1 month |  |
Period of ability to redeem invested amounts on call deposits |  |  | 31 days |  |
Maximum |  |  |  |  |
Investments in time and call deposits |  |  |  |  |
Maturity of time deposits |  |  | 12 months |  |
Period of ability to redeem invested amounts on call deposits |  |  | 95 days |  |

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