Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue:
Total revenue	$ 680.3	$ 403.8
Costs and expenses:
Cost of revenue	260.7	146.2
Research and development	140.7	197.8
Sales and marketing	248.7	123.2
General and administrative	35.7	28.2
Total costs and expenses	685.8	495.4
Income (loss) from operations	(5.5)	(91.6)
Interest income	1.7	5.5
Interest expense	(14.7)	(7.0)
Other income (expense), net	8.9	(2.3)
Income (loss) before income taxes	(9.6)	(95.4)
Provision for (benefit from) income taxes	13.4	8.5
Net income (loss)	$ (23.0)	$ (103.9)
Net income (loss) per share attributable to common stockholders:
Basic	$ (0.02)	$ (0.11)
Diluted	$ (0.02)	$ (0.11)
Weighted-average common shares used to compute net income (loss) per share attributable to common stockholders:
Basic	1,084,400	952,500
Diluted	1,084,400	952,500
Online Game [Member]
Revenue:
Total revenue	$ 557.0	$ 344.4
Advertising and Other [Member]
Revenue:
Total revenue	$ 123.3	$ 59.4