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Cash and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Cash and Cash Equivalents [Abstract] |
Schedule of Investment Components | 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 |
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 | $ | 49.4 |  |  | $ | 62.9 |  |  | $ | — |  |  | $ | 112.3 |
Equity securities | — |  |  | — |  |  | 82.2 |  |  | 82.2 |
Total | $ | 49.4 |  |  | $ | 62.9 |  |  | $ | 82.2 |  |  | $ | 194.5 |
Schedule of Restricted Cash | Restricted cash consisted of the following (in millions):
| As of December 31,
| 2022 |  | 2021
Current: |  |  |
Affiliate cash | $ | 12.9 |  |  | $ | 14.7 |
Self-insured captive funds | 17.3 |  |  | 47.8 |
Other | 1.4 |  |  | — |
| 31.6 |  |  | 62.5 |
Noncurrent: |  |  |
Self-insured captive funds | — |  |  | 0.4 |
Total restricted cash | $ | 31.6 |  |  | $ | 62.9 |
Schedule of 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,
| 2022 |  | 2021 |  | 2020
Proceeds from sales and maturities of available-for-sale marketable securities | $ | — |  |  | $ | — |  |  | $ | 12.6 |

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