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Divestitures - Narrative (Details) - Discontinued Operations, Disposed of by Sale - MyCase - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
Jun. 30, 2021
Jun. 30, 2021
Business Acquisition [Line Items]      
Consideration for disposal of subsidiary $ 193.0    
Proceeds from divestiture of subsidiary 192.2    
Employee retention bonus pool 2.2    
Cash divested 0.8    
Working capital adjustment $ 0.6    
Retention period 1 year    
Gain on sale of subsidiary $ 188.0    
Assets divested 4.6    
Adjustment to the employee retention bonus pool 0.4    
Capitalized software divested 3.9    
Deferred revenue divested 2.8    
Goodwill divested $ 2.3    
Income received   $ 0.3 $ 0.7