Cash and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2021

Cash and Cash Equivalents [Abstract]

Schedule of Investment Components

The components of our investments as of December 31, 2021 are as follows (in millions):

	Cash & Cash Equivalents		Restricted Cash		Restricted Marketable Securities		Total
Cash	$	54.8	$	65.5	$	—	$	120.3
Equity securities	—		—		82.2		82.2
Total	$	54.8	$	65.5	$	82.2	$	202.5

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

Schedule of Restricted Cash

Restricted cash consisted of the following (in millions):

	As of December 31,
	2021		2020
Current:
Affiliate cash	$	17.3	$	17.5
Self-insured captive funds	47.8		47.9
	65.1		65.4
Noncurrent:
Self-insured captive funds	0.4		21.5
Total restricted cash	$	65.5	$	86.9

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,
	2021		2020		2019
Proceeds from sales and maturities of available-for-sale marketable securities	$	—	$	12.6	$	6.4