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Common Stock (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Jul. 27, 2015 USD ($) | Apr. 30, 2013 USD ($)
Common Stock |  |  |  |
Common Stock conversion ratio, at the option of the holder | 1 |  |  |
Class A |  |  |  |
Common Stock |  |  |  |
Common Stock, votes per share (Number of votes) | 1 | 1 |  |
Shares of Common Stock reserved for issuance under stock-based compensation plans | 3,122,011 |  |  |
Options to purchase shares of Class A common stock | $ |  |  | $ 100.0 | $ 90.0
Number of shares repurchased | 812,540 | 669,681 |  |
Cost of shares of Class A common stock repurchased | $ | $ 44.6 | $ 39.6 |  |
Class A | April 30, 2013 |  |  |  |
Common Stock |  |  |  |
Number of shares repurchased | 497,010 | 669,681 |  |
Cost of shares of Class A common stock repurchased | $ | $ 27.3 | $ 39.6 |  |
Class A | July 27, 2015 |  |  |  |
Common Stock |  |  |  |
Number of shares repurchased | 315,530 |  |  |
Cost of shares of Class A common stock repurchased | $ | $ 17.3 |  |  |
Class B |  |  |  |
Common Stock |  |  |  |
Common Stock, votes per share (Number of votes) | 10 | 10 |  |
Shares of Common Stock reserved for conversion | 6,379,290 |  |  |

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- Definition There is no established public trading market for our Class B Common Stock, which is held exclusively by members of the Horne family. The principal holders of such stock are subject to restrictions on transfer with respect to their shares. Each share of our Class B Common Stock (10 votes per share) is convertible into one share of Class A Common Stock (1 vote per share). + References No definition available. + Details
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