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Cash and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Cash and Cash Equivalents [Abstract] |
Schedule of Investment Components | 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 |
The components of our investments as of December 31, 2015 are as follows (in millions):
| Cash & Cash Equivalents |  | Restricted Cash |  | Restricted Marketable Securities |  | Total
Cash | $ | 61.6 |  |  | $ | 45.9 |  |  | $ | — |  |  | $ | 107.5 |
Equity securities | — |  |  | — |  |  | 56.2 |  |  | 56.2 |
Total | $ | 61.6 |  |  | $ | 45.9 |  |  | $ | 56.2 |  |  | $ | 163.7 |
Schedule of Restricted Cash | As of December 31, 2016 and 2015, Restricted cash consisted of the following (in millions):
| As of December 31,
| 2016 |  | 2015
Affiliate cash | $ | 22.9 |  |  | $ | 20.3 |
Self-insured captive funds | 38.0 |  |  | 25.6 |
Total restricted cash | $ | 60.9 |  |  | $ | 45.9 |
Available-for-sale Securities Cost to Fair Value Reconciliation | A summary of our restricted marketable securities as of December 31, 2015 is as follows (in millions):
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Equity securities | $ | 58.3 |  |  | $ | 0.3 |  |  | $ | (2.4 | ) |  | $ | 56.2 |
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 |
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,
| 2016 |  | 2015 |  | 2014
Proceeds from sales of restricted available-for-sale securities | $ | — |  |  | $ | — |  |  | $ | — |
Proceeds from sales of nonrestricted available-for-sale securities | $ | — |  |  | $ | 12.8 |  |  | $ | 2.7 |
Gross realized gains | $ | — |  |  | $ | 1.2 |  |  | $ | 0.5 |
Gross realized losses | $ | — |  |  | $ | — |  |  | $ | (0.1 | )

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- Definition Tabular disclosure of the cash and cash items which are restricted as to withdrawal or usage. The provisions of any restrictions are described in a note to the financial statements. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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