INVESTMENTS

Available for Sale Securities

Our available for sale securities are reported in Prepaid expenses and other current assets. Unrealized investment gains (losses) on available for sale securities were as follows (in millions):



	October 1, 2016		December 31, 2015
Equity securities, at cost less impairments	$	20.1	$	6.4
Gross unrealized gains	32.9		9.3
Gross unrealized losses	—		(0.8		)
Estimated fair value of equity securities	$	53.0	$	14.9

The factors affecting the assessment of impairments include both general financial market conditions and factors specific to a particular company. We recorded impairment charges of $1.8 million related to other-than-temporary impairments of marketable equity securities during the nine months ended October 1, 2016 due to prolonged losses incurred on each of the investments.

Cost Method Investments

Our cost method investments totaled $7.0 million and $6.9 million at October 1, 2016 and December 31, 2015, respectively, and are included in Other non-current assets.

Equity Method Investments

Our equity method investments totaled $4.9 million and $45.5 million at October 1, 2016 and December 31, 2015, respectively, and are included in Other non-current assets.

Due to significant and prolonged losses incurred on one of our equity method investments, we recorded a $22.3 million impairment in Other expense, net, during the nine months ended October 1, 2016. In addition, during the nine months ended October 1, 2016, one of our equity method investments became publicly traded. As a result, we transferred the $15.5 million investment to available for sale and recorded an $8.7 million unrealized gain, net of tax, in Other Comprehensive Income ("OCI"), as reflected in the available for sale securities table above.

We recorded a net gain of $0.1 million and a net loss of $2.4 million during the three months ended October 1, 2016 and September 26, 2015, respectively, and a net loss of $3.8 million and $7.7 million during the nine months ended October 1, 2016, and September 26, 2015, respectively, for our proportionate share of the equity method investment earnings or losses. The gains and losses were recorded in Other expense, net.