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Cash and Marketable Securities (Tables) | 12 Months Ended
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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 |

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