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Cash and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2017

The components of our investments as of December 31, 2017 are as follows (in millions):



	Cash & Cash Equivalents		Restricted Cash		Restricted Marketable Securities		Total
Cash	$	54.4	$	62.4	$	—	$	116.8
Equity securities	—		—		62.0		62.0
Total	$	54.4	$	62.4	$	62.0	$	178.8

The components of our investments as of December 31, 2016 are as follows (in millions):



	Cash & Cash Equivalents		Restricted Cash		Restricted Marketable Securities		Total
Cash	$	40.5	$	60.9	$	—	$	101.4
Equity securities	—		—		57.7		57.7
Total	$	40.5	$	60.9	$	57.7	$	159.1

As of December 31, 2017 and 2016, Restricted cash consisted of the following (in millions):

A summary of our restricted marketable securities as of December 31, 2016 is as follows (in millions):

A summary of our restricted marketable securities as of December 31, 2017 is as follows (in millions):

Investing information related to our restricted marketable securities is as follows (in millions):



	For the Year Ended December 31,
	2017		2016		2015
Proceeds from sales of restricted available-for-sale securities	$	4.0	$	—	$	—
Proceeds from sales of nonrestricted available-for-sale securities	$	—	$	—	$	12.8
Gross realized gains	$	—	$	—	$	1.2
Gross realized losses	$	—	$	—	$	—