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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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