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Stockholders' Equity and Compensation Arrangements Initial Public Offering, Convertible Preferred Stock and Common Stock (Details) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 class | Sep. 30, 2017 USD ($) class shares | Dec. 31, 2016 shares
Preferred Stock, Shares Outstanding |  | 0 | 0
Preferred Stock, Shares Authorized |  | 50,000,000 |
Classes of common stock, number | class | 3 | 1 |
Common Stock [Member] |  |  |
Common Stock, Shares Authorized |  | 2,010,000,000 | 2,010,000,000
Common Class A [Member] |  |  |
Stock Repurchase Program, Authorized Amount | $ |  | $ 700.0 |

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