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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Donation of common stock to charitable foundation | $ 0.0 | $ 9.4 | $ 0.0
Cash contributions to charitable foundation |  | 1.9 |
Two-Tier RSUs |  |  |
Recognized cumulative unrecognized stock-based compensation | 418.7 |  |
Cost of revenue |  |  |
Allocated share-based compensation expense | 47.0 | 12.2 | 8.2
Research and development |  |  |
Allocated share-based compensation expense | 368.2 | 93.1 | 72.7
Sales and marketing |  |  |
Allocated share-based compensation expense | 94.3 | 33.7 | 44.6
General and administrative |  |  |
Allocated share-based compensation expense | $ 140.6 | 25.6 | $ 22.1
Donation of common stock to charitable foundation |  | $ 9.4 |

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