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Acquisitions - 2018 Acquisitions (Details) - USD ($) $ in Millions	Jul. 02, 2018	May 15, 2018	Dec. 31, 2019	Dec. 31, 2018
StudyBlue, Inc.
Business Acquisition [Line Items]
Total fair value of purchase consideration	$ 20.4
Escrow	$ 3.3
WriteLab, Inc.
Business Acquisition [Line Items]
Total fair value of purchase consideration		$ 14.5
Escrow		2.6
Contingent consideration arrangements, range of outcomes, value, high		$ 5.0
Contingent purchase consideration, cash			$ 1.0	$ 1.0

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- Definition

Business Combination, Consideration Transferred, Escrow

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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