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Business Combinations - Schedule of Purchase Consideration (Details) - HelloSign Inc.
$ in Millions
Feb. 08, 2019
USD ($)
Business Acquisition [Line Items]  
Fair value of assumed HelloSign options attributable to pre-combination services $ 0.8
Purchase price adjustments (0.5)
Total purchase consideration 177.9
Preferred Stockholders and Vested Option Holders  
Business Acquisition [Line Items]  
Cash and transaction costs paid 175.2
HelloSign  
Business Acquisition [Line Items]  
Cash and transaction costs paid $ 2.4