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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cost of revenue    
Allocated share-based compensation expense $ 3.0 $ 37.8
Research and development    
Allocated share-based compensation expense 30.5 282.9
Sales and marketing    
Allocated share-based compensation expense 7.1 72.4
General and administrative    
Allocated share-based compensation expense $ 15.0 $ 93.4