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Stockholders' Equity - Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 35 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased in association with tax withholdings on the vesting of RSUs (in shares) | 30,119 | 32,457 | 94,826 |
Class A common stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) | 2,112,370 | 329,000 | 1,312,848 | 3,155,095
Total purchase price (in millions) | $ 179.0 | $ 30.5 | $ 104.4 |
Average purchase price per share (in dollars per share) | $ 84.72 | $ 92.79 | $ 79.50 | $ 84.43

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