INVESTMENTS

The following table summarizes our equity security measurement category, balance sheet location, and balances (in millions):



Measurement Category	Balance Sheet Location	March 31, 2018		December 31, 2017⁽²⁾
Fair value method	Prepaid expenses and other current assets	$	13.8	$	17.0
Fair value method⁽¹⁾	Other non-current assets	$	5.1	$	6.3
Equity method	Other non-current assets	$	4.7	$	4.9

⁽¹⁾ The March 31, 2018 equity securities are measured at fair value using the Net Asset Value practical expedient.

⁽²⁾ The December 31, 2017 balances presented reflect historical recognition and measurement investment categories existing prior to the adoption of ASU 2016-01, which include available for sale and cost method securities.

The following table summarizes our equity security expense (income) recognized in earnings (in millions):



		Three Months Ended
Measurement Category	Income Statement Location	March 31, 2018		April 1, 2017
Fair value method	Other expense (income), net	$	4.4	$	—
Equity method	Other expense (income), net	$	0.2	$	(0.1	)

On January 1, 2018, as a result of the adoption of ASU 2016-01, we made a $1.4 million cumulative-effect adjustment to Retained earnings (accumulated deficit) that consisted of net unrealized losses on previously classified available for sale securities from Other comprehensive income ("OCI").