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Cash and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Cash and Cash Equivalents [Abstract]

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
Marketable securities	—		—		62.0		62.0
Total	$	54.4	$	62.4	$	62.0	$	178.8

The components of our investments as of December 31, 2018 are as follows (in millions):



	Cash & Cash Equivalents		Restricted Cash		Restricted Marketable Securities		Total
Cash	$	69.2	$	64.3	$	—	$	133.5
Marketable securities	—		—		62.0		62.0
Total	$	69.2	$	64.3	$	62.0	$	195.5

Schedule of Restricted Cash

As of December 31, 2018 and 2017, Restricted cash consisted of the following (in millions):



	As of December 31,
	2018		2017
Current:
Affiliate cash	$	16.4	$	18.1
Self-insured captive funds	42.6		44.3
	59.0		62.4
Noncurrent:
Self-insured captive funds	5.3		—
Total restricted cash	$	64.3	$	62.4

Available-for-sale Securities Cost to Fair Value Reconciliation

A summary of our restricted marketable securities as of December 31, 2017, as required for equity securities prior to ASU No. 2016-01, is as follows (in millions):



	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Marketable securities	$	64.0	$	0.3	$	(2.3	)	$	62.0

Investment information related to restricted marketable securities

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



	For the Year Ended December 31,
	2018			2017		2016
Proceeds from sales of restricted marketable securities	$	11.4		$	4.0	$	—
Gross realized losses	$	(0.6	)	$	—	$	—