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Stockholders' Equity - Summary of Share Repurchases (Details) - Class A - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 59 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased pursuant to repurchase authorizations | 563,953 | 0 | 2,112,370 | 3,719,048
Total purchase price (in millions) | $ 46.1 | $ 0.0 | $ 179.0 |
Average purchase price per share (in dollars per share) | $ 81.71 | $ 0 | $ 84.72 | $ 84.02
Restricted Stock Units (RSUs) |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased in association with tax withholdings on the vesting of RSUs | 30,620 | 40,356 | 30,119 |

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