Cash and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2023

Cash and Cash Equivalents [Abstract]

Schedule of Investment Components

The components of our investments as of December 31, 2023 are as follows (in millions):

	Cash & Cash Equivalents		Restricted Cash		Restricted Marketable Securities		Total
Cash	$	69.1	$	35.1	$	—	$	104.2
Equity securities	—		—		126.2		126.2
Total	$	69.1	$	35.1	$	126.2	$	230.4

The components of our investments as of December 31, 2022 are as follows (in millions):

	Cash & Cash Equivalents		Restricted Cash		Restricted Marketable Securities		Total
Cash	$	21.8	$	31.6	$	—	$	53.4
Equity securities	—		—		110.0		110.0
Total	$	21.8	$	31.6	$	110.0	$	163.4

Schedule of Restricted Cash

Restricted cash consisted of the following (in millions):

	As of December 31,
	2023		2022
Current:
Affiliate cash	$	17.7	$	12.9
Self-insured captive funds	17.1		17.3
Other	0.3		1.4
Total restricted cash	$	35.1	$	31.6