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Investments in Marketable Securities | 6 Months Ended
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Jun. 30, 2018
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities As of December 31, 2017 and June 30, 2018, the fair value of marketable securities, which are principally equity securities, was $77.8 million and $84.1 million, respectively. Investments in marketable securities are reported within Investments and other assets. The following is a summary of the cost, gross unrealized gains and losses and fair value of investments in marketable securities:
| December 31, 2017 |  | June 30, 2018
Cost | $ | 67.1 |  |  | $ | 73.9 |
Unrealized gains | 13.0 |  |  | 12.5 |
Unrealized losses | (2.3 | ) |  | (2.3 | )
Fair value | $ | 77.8 |  |  | $ | 84.1 |
In the three and six months ended June 30, 2017, the Company received proceeds of $21.0 million and $58.3 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $8.4 million and $15.1 million, respectively. In the three and six months ended June 30, 2018, the Company received proceeds of $12.1 million and $25.9 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $1.3 million and $4.1 million, respectively.

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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 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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