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Investments in Marketable Securities | 3 Months Ended
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Mar. 31, 2018
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities As of December 31, 2017 and March 31, 2018, the fair value of marketable securities was $77.8 million and $81.0 million, respectively, and marketable securities were principally investments in equity securities. 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 |  | March 31, 2018
Cost | $ | 67.1 |  |  | $ | 74.2 |
Unrealized gains | 13.0 |  |  | 9.0 |
Unrealized losses | (2.3 | ) |  | (2.2 | )
Fair value | $ | 77.8 |  |  | $ | 81.0 |
In the three months ended March 31, 2017 and 2018, the Company received proceeds of $37.3 million and $13.8 million, respectively, from the sale of investments in marketable securities and recorded net gains of $6.7 million and $2.8 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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