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Investments in Marketable Securities | 9 Months Ended
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Sep. 30, 2017
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities Investments in marketable securities at December 31, 2016 and September 30, 2017 were $122.4 million and $92.4 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 |  | September 30, 2017 |  | December 31, 2016 |  | September 30, 2017
Cost | $ | 66.1 |  |  | $ | 30.5 |  |  | $ | 34.4 |  |  | $ | 44.2 |
Unrealized gains | 17.6 |  |  | 10.8 |  |  | 6.6 |  |  | 8.5 |
Unrealized losses | (1.8 | ) |  | — |  |  | (0.5 | ) |  | (1.6 | )
Fair Value | $ | 81.9 |  |  | $ | 41.3 |  |  | $ | 40.5 |  |  | $ | 51.1 |
In the three and nine months ended September 30, 2016, the Company received proceeds of $12.6 million and $47.0 million, respectively, from the sale of investments classified as available-for-sale and recorded gains of $6.2 million and $15.4 million, respectively. In the three and nine months ended September 30, 2017, the Company received proceeds of $15.4 million and $58.7 million, respectively, from the sale of investments classified as available-for-sale and recorded gains of $7.4 million and $19.2 million, respectively. There were no significant realized gains or losses on investments classified as trading in the three and nine months ended September 30, 2016. In the three and nine months ended September 30, 2017, the Company received proceeds of $8.2 million and $23.2 million, respectively, from the sale of investments classified as trading and recorded net gains of $1.7 million and $5.0 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 The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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