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Investments - Other Investment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Investment |  |  |
Impairment charges for investments | $ 0.0 | $ 0.0 | $ 0.0
Kateeva |  |  |
Other Investment |  |  |
Carrying amount | $ 21.0 | $ 21.0 |
Kateeva | Maximum |  |  |
Other Investment |  |  |
Percentage ownership of cost method investee | 20.00% |  |
Separate non-marketable investment |  |  |
Other Investment |  |  |
Amount of investment made | $ 3.5 |  |
Separate non-marketable investment | Maximum |  |  |
Other Investment |  |  |
Percentage ownership of cost method investee | 20.00% |  |

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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- Definition Aggregate carrying value of owned private equity or other securities for which a quoted market price is not readily determinable, the value of which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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