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Acquisitions (Details) - Mathway, LLC - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 04, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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   $ 0.4   $ 0.4  
Acquisition related costs   3.1      
Pro forma net income (loss)   $ 12.7 $ (12.6) $ 4.8 $ (19.2)