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

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