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Investments in Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities Investments in marketable securities at December 31, 2016 and 2017 were $122.4 million and $77.8 million, respectively. The following is a summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading:
|  | Available-for-Sale |  | Trading
|  | December 31, 2016 |  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2017
Cost |  | $ | 66.1 |  |  | $ | 18.3 |  |  | $ | 34.4 |  |  | $ | 48.8 |
Unrealized Gains |  | 17.6 |  |  | 2.7 |  |  | 6.6 |  |  | 10.3 |
Unrealized Losses |  | (1.8 | ) |  | (0.4 | ) |  | (0.5 | ) |  | (1.9 | )
Fair Value |  | $ | 81.9 |  |  | $ | 20.6 |  |  | $ | 40.5 |  |  | $ | 57.2 |
For the years ended December 31, 2016 and 2017, the Company received proceeds of $61.1 million and $82.3 million, respectively, from the sale of investments classified as available-for-sale and recorded net gains of $19.2 million and $29.2 million, respectively. For the years ended December 31, 2016 and 2017, the Company received proceeds of $82.8 million and $29.9 million, respectively, from the sale of investments classified as trading and recorded net gains of $1.0 million and $6.6 million, respectively. The realized gains and losses on securities held in Affiliate sponsored consolidated products were recorded in Other operating expenses (net), other realized gains and losses were recorded in Investment and other income.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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