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):



	April 1, 2017		December 31, 2016
Equity securities, at cost less impairments	$	15.5	$	16.5
Gross unrealized gains	7.3		21.7
Estimated fair value of equity securities	$	22.8	$	38.2

The factors affecting the assessment of impairments include both general financial market conditions and factors specific to a particular company. During the year ended December 31, 2016, we recorded an impairment charge of $1.8 million, related to other-than-temporary impairments of marketable equity securities due to prolonged losses incurred on each of the investments.

During the three months ended April 1, 2017 and the year ended December 31, 2016, we sold a number of our investment securities and recorded gains of $1.6 million and $1.0 million, respectively. The gains were reclassified out of Accumulated Other Comprehensive Income (loss) ("AOCI") and into earnings.

Cost Method Investments

Our cost method investments totaled $6.9 million at April 1, 2017, and December 31, 2016, and are included in Other non-current assets.

Equity Method Investments

Our equity method investments totaled $4.8 million and $4.6 million at April 1, 2017 and December 31, 2016, respectively, and are included in Other non-current assets. We recorded a net gain of $0.1 million and a net loss of $2.4 million during the three months ended April 1, 2017 and April 2, 2016, respectively, for our proportionate share of the equity method investment earnings or losses. The gains and losses were recorded in Other expense, net.

During the three months ended April 2, 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").