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Investments in Marketable Securities
 12 Months Ended
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.