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Acquisitions (Details) - Mathway, LLC - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jun. 04, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Fair value of purchase consideration	$ 101.0
Initial cash consideration	93.5
Escrow	$ 7.5
Remaining escrow release period	15 months
Contingent payments	$ 15.0
Contingent consideration, liability		$ 1.7		$ 1.7
Acquisition related costs				3.1
Pro forma net income (loss)		$ (37.3)	$ (14.1)	$ (32.3)	$ (33.3)

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