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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 21, 2019 shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) vote $ / shares shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares | Oct. 22, 2018 shares
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased in association with tax withholdings on the vesting of RSUs (in shares) |  |  | 40,356 | 30,119 | 32,457 |
Payments for repurchase of capped call options | $ |  | $ 36.5 |  |  |  |
Proceeds received from capped call options expirations | $ |  |  | $ 38.9 |  |  |
Class A common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Conversion of common stock (in shares) |  |  | 1 |  |  |
Common stock number of votes | vote |  |  | 1 |  |  |
Additional amount authorized to be repurchased |  |  |  |  |  | 250,000,000
Class A common stock | Restricted Stock Units (RSUs) |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Treasury stock acquired, average cost (in dollars per share) | $ / shares |  |  | $ 80.39 |  |  |
Adjustments related to tax withholding for share-based compensation | $ |  |  | $ 3.2 |  |  |
Class A common stock | The 2016 Stock Repurchase Authorization |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Remaining authorized repurchase amount | $ |  |  | $ 233.6 |  |  |
Class B common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percentage of Class B common to total common stock subject to automatic conversion |  |  | 1.00% |  |  |
Common stock number of votes | vote |  |  | 10 |  |  |
Number of shares that were agreed to be converted (in shares) | 1,000,000 |  |  |  |  |
Percent of shares required to be converted by the end of every two years | 15.00% |  |  |  |  |
Stock conversion, term | 2 years |  |  |  |  |
Percent of shares required to be converted by December 31, 2020 | 15.00% |  |  |  |  |
Percent of shares required to be converted by December 31, 2022 | 30.00% |  |  |  |  |
Percent of shares required to be converted by December 31, 2024 | 45.00% |  |  |  |  |
Number of shares issued in transaction |  |  | 600,000 |  |  |

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