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Cash and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash and Cash Equivalents [Abstract] |
Schedule of Investment Components | The components of our investments as of December 31, 2018 are as follows (in millions):
| Cash & Cash Equivalents |  | Restricted Cash |  | Restricted Marketable Securities |  | Total
Cash | $ | 69.2 |  |  | $ | 64.3 |  |  | $ | — |  |  | $ | 133.5 |
Equity securities | — |  |  | — |  |  | 55.6 |  |  | 55.6 |
Debt securities | — |  |  | — |  |  | 6.4 |  |  | 6.4 |
Total | $ | 69.2 |  |  | $ | 64.3 |  |  | $ | 62.0 |  |  | $ | 195.5 |
The components of our investments as of December 31, 2019 are as follows (in millions):
| Cash & Cash Equivalents |  | Restricted Cash |  | Restricted Marketable Securities |  | Total
Cash | $ | 94.8 |  |  | $ | 64.8 |  |  | $ | — |  |  | $ | 159.6 |
Equity securities | — |  |  | — |  |  | 63.5 |  |  | 63.5 |
Debt securities | — |  |  | — |  |  | 12.6 |  |  | 12.6 |
Total | $ | 94.8 |  |  | $ | 64.8 |  |  | $ | 76.1 |  |  | $ | 235.7 |
Schedule of Restricted Cash | As of December 31, 2019 and 2018, Restricted cash consisted of the following (in millions):
| As of December 31,
| 2019 |  | 2018
Current: |  |  |
Affiliate cash | $ | 16.0 |  |  | $ | 16.4 |
Self-insured captive funds | 41.4 |  |  | 42.6 |
| 57.4 |  |  | 59.0 |
Noncurrent: |  |  |
Self-insured captive funds | 7.4 |  |  | 5.3 |
Total restricted cash | $ | 64.8 |  |  | $ | 64.3 |
Available-for-sale Securities Cost to Fair Value Reconciliation | A summary of our available-for-sale marketable securities as of December 31, 2019 is as follows (in millions):
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities | $ | 12.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 12.6 |
A summary of our available-for-sale marketable securities as of December 31, 2018 is as follows (in millions):
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities | $ | 6.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 6.4 |
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,
| 2019 |  | 2018 |  | 2017
Proceeds from sales and maturities of available-for-sale marketable securities | $ | 6.4 |  |  | $ | — |  |  | $ | 4.0 |
Debt Securities, Held-to-maturity | Scheduled maturities of investments in debt securities at December 31, 2019 were as follows (in millions):
| Cost |  | Fair Value
Due in one year or less | $ | 12.6 |  |  | $ | 12.6 |
Due after one year through five years | — |  |  | — |
Due after five years through ten years | — |  |  | — |
Due after ten years | — |  |  | — |
Total | $ | 12.6 |  |  | $ | 12.6 |

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