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Stockholders' Equity (Details) - USD ($) | 2 Months Ended | 9 Months Ended | 56 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Jul. 24, 2020 | Oct. 22, 2018
Class A common stock |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Additional authorized repurchase amount |  |  |  |  | $ 250,000,000
Authorized repurchase amount | $ 500,000,000 | $ 500,000,000 | $ 500,000,000 |  |
Shares repurchased pursuant to repurchase authorizations (in shares) |  | 563,953 | 3,719,048 |  |
Shares repurchased pursuant to repurchase authorizations, average price (in dollars per share) |  | $ 81.71 | $ 84.02 |  |
Remaining authorized repurchase amount | $ 187,500,000 | $ 187,500,000 | $ 187,500,000 |  |
Class A common stock | Restricted Stock Units (RSUs) |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares repurchased |  | 30,143 |  |  |
Average purchase price per share (in dollars per share) |  | $ 147.12 |  |  |
Amount related to tax withholdings associated with vesting of RSUs |  | $ 4,400,000 |  |  |
ATM Equity Offering |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Sale of stock, maximum aggregate gross sales price |  |  |  | $ 400,000,000 |
Sale of stock, number of shares issued (in shares) | 0 |  |  |  |

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