Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Breakage, revenue recognition period one			3 months
Breakage, revenue recognition period two			6 months
Deferred revenue increase			$ 72.7
Deferred revenue recognized			72.7
User pay revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Breakage, revenue recognized	$ 0.9	$ 1.6	$ 0.9	$ 1.6