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Cash and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

Cash and Cash Equivalents [Abstract]

Schedule of Investment Components

The components of our investments as of December 31, 2020 are as follows (in millions):

			Cash & Cash Equivalents						Restricted Cash						Restricted Marketable Securities						Total
Cash			$	224.0					$	86.9					$	—					$	310.9
Equity securities			—						—						72.6						72.6
Total			$	224.0					$	86.9					$	72.6					$	383.5

The components of our investments as of December 31, 2019 are as follows (in millions):

			Cash & Cash Equivalents						Restricted Cash						Restricted Marketable Securities						Total
Cash			$	94.8					$	64.8					$	—					$	159.6
Equity securities			—						—						63.5						63.5
Debt securities			—						—						12.6						12.6
Total			$	94.8					$	64.8					$	76.1					$	235.7

Schedule of Restricted Cash

As of December 31, 2020 and 2019, Restricted cash consisted of the following (in millions):

			As of December 31,
			2020						2019
Current:
Affiliate cash			$	17.5					$	16.0
Self-insured captive funds			47.9						41.4
			65.4						57.4
Noncurrent:
Self-insured captive funds			21.5						7.4
Total restricted cash			$	86.9					$	64.8

Available-for-sale Securities Cost to Fair Value Reconciliation

A summary of our available-for-sale marketable securities as of December 31, 2019 is as follows (in millions):

			Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Debt securities			$	12.6					$	—					$	—					$	12.6

Investment Information Related to Restricted Marketable Securities

Investing information related to our available-for-sale marketable securities is as follows (in millions):

			For the Year Ended December 31,
			2020						2019						2018
Proceeds from sales and maturities of available-for-sale marketable securities			$	12.6					$	6.4					$	—

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