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Fair Value of Financial Instruments - Time and Call Deposits (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Investments in time and call deposits |  |  |
Cash equivalents | $ 0.0 |  |
Short-term investments | 210.6 |  | $ 201.2
Unrealized gains (losses) on available-for-sale securities | $ 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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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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