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Investments in Marketable Securities
 3 Months Ended
Mar. 31, 2017
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2016 and March 31, 2017 were $122.4 million and $115.5 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
 
March 31,
2017
 
December 31,
2016
 
March 31,
2017
Cost
$
66.1

 
$
42.2

 
$
34.4

 
$
41.0

Unrealized gains
17.6

 
24.6

 
6.6

 
8.3

Unrealized losses
(1.8
)
 
—

 
(0.5
)
 
(0.6
)
Fair Value
$
81.9

 
$
66.8

 
$
40.5

 
$
48.7


For the three months ended March 31, 2016 and 2017, the Company received proceeds of $5.8 million and $30.2 million, respectively, from the sale of investments classified as available-for-sale and recorded gains of $1.7 million and $5.8 million, respectively. These gains and losses were recorded in Investment and other income. There were no significant realized gains or losses on investments classified as trading in the three months ended March 31, 2016 and 2017.