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Stockholders' Equity - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 24, 2020 USD ($) | Oct. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) vote $ / shares shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares | Oct. 22, 2018 USD ($)
Follow-On Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Aggregate net proceeds from stock offering |  | $ 777,600,000 |  |  |  |
Payments of stock issuance costs |  | $ 500,000 |  |  |  |
ATM Equity Offering Agreement |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Aggregate net proceeds from stock offering | $ 400,000,000.0 |  |  |  |  |
Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Conversion of common stock (in shares) | shares |  |  | 1 |  |  |
Common stock number of votes | vote |  |  | 1 |  |  |
Additional amount authorized to be repurchased |  |  |  |  |  | $ 250,000,000
Authorized repurchase amount |  |  | $ 500,000,000 |  |  |
Remaining authorized repurchase amount |  |  | $ 187,500,000 |  |  |
Class A | Follow-On Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares sold in offering | shares |  | 3,659,091 |  |  |  |
Offering price per share (in dollars per share) | $ / shares |  | $ 220.00 |  |  |  |
Class A | Over-Allotment Option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares sold in offering | shares |  | 477,272 |  |  |  |
Class A | Restricted Stock Units (RSUs) |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased in association with tax withholdings on the vesting of RSUs | shares |  |  | 30,620 | 40,356 | 30,119 |
Weighted average per share price of shares purchased (in dollars per share) | $ / shares |  |  | $ 149.02 |  |  |
Adjustments related to tax withholding for share-based compensation |  |  | $ 4,600,000 |  |  |
Class B |  |  |  |  |  |
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 |  |  |

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