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Cash and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash and Cash Equivalents [Abstract] |
Schedule of Investment Components | The components of our investments as of December 31, 2017 are as follows (in millions):
| Cash & Cash Equivalents |  | Restricted Cash |  | Restricted Marketable Securities |  | Total
Cash | $ | 54.4 |  |  | $ | 62.4 |  |  | $ | — |  |  | $ | 116.8 |
Equity securities | — |  |  | — |  |  | 62.0 |  |  | 62.0 |
Total | $ | 54.4 |  |  | $ | 62.4 |  |  | $ | 62.0 |  |  | $ | 178.8 |
The components of our investments as of December 31, 2016 are as follows (in millions):
| Cash & Cash Equivalents |  | Restricted Cash |  | Restricted Marketable Securities |  | Total
Cash | $ | 40.5 |  |  | $ | 60.9 |  |  | $ | — |  |  | $ | 101.4 |
Equity securities | — |  |  | — |  |  | 57.7 |  |  | 57.7 |
Total | $ | 40.5 |  |  | $ | 60.9 |  |  | $ | 57.7 |  |  | $ | 159.1 |
Schedule of Restricted Cash | As of December 31, 2017 and 2016, Restricted cash consisted of the following (in millions):
| As of December 31,
| 2017 |  | 2016
Affiliate cash | $ | 18.1 |  |  | $ | 22.9 |
Self-insured captive funds | 44.3 |  |  | 38.0 |
Total restricted cash | $ | 62.4 |  |  | $ | 60.9 |
Available-for-sale Securities Cost to Fair Value Reconciliation | A summary of our restricted marketable securities as of December 31, 2016 is as follows (in millions):
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Equity securities | $ | 59.6 |  |  | $ | 0.2 |  |  | $ | (2.1 | ) |  | $ | 57.7 |
A summary of our restricted marketable securities as of December 31, 2017 is as follows (in millions):
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Equity securities | $ | 64.0 |  |  | $ | 0.3 |  |  | $ | (2.3 | ) |  | $ | 62.0 |
Investment information related to restricted marketable securities | Investing information related to our restricted marketable securities is as follows (in millions):
| For the Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Proceeds from sales of restricted available-for-sale securities | $ | 4.0 |  |  | $ | — |  |  | $ | — |
Proceeds from sales of nonrestricted available-for-sale securities | $ | — |  |  | $ | — |  |  | $ | 12.8 |
Gross realized gains | $ | — |  |  | $ | — |  |  | $ | 1.2 |
Gross realized losses | $ | — |  |  | $ | — |  |  | $ | — |

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