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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Stockholders' Equity Note [Abstract] |
Schedule of change in the number of shares of Class A common stock | The following table sets forth the change in the number of shares of Class A common stock outstanding during the fiscal years ended December 31, 2015 and 2014:
|  | December 31,
|  | 2015 |  | 2014
Shares outstanding as of beginning of period |  | 85.1 |  |  | 85.2 |
Shares issued as part of equity-based compensation plans and the ESPP, net of shares surrendered |  | 1.4 |  |  | 1.9 |
Shares repurchased into treasury stock |  | — |  |  | (2.0 | )
Shares outstanding as of end of period |  | 86.5 |  |  | 85.1 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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