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Acquisitions - 2020 Acquisition (Details) - Mathway, LLC - USD ($) $ in Millions		12 Months Ended
	Jun. 04, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Business Acquisition [Line Items]
Ownership percent of stock acquired	100.00%
Fair value of purchase consideration	$ 101.0
Payments for contingent consideration arrangements	93.5
Escrow	7.5
Contingent payments	$ 15.0
Contingent purchase consideration, cash		$ 2.9		$ 0.4
Acquisition related expenses		3.1
Pro forma net loss		$ 6.1	$ 27.3

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