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Business Acquisition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 15, 2020
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Equity interests acquired       18.10%
Collateral Analytics and DocVerify        
Business Acquisition [Line Items]        
Total consideration, net     $ 73.5  
Optimal Blue Holdco, LLC        
Business Acquisition [Line Items]        
Total consideration, net $ 1,798.8      
Equity interests acquired 100.00%      
Direct transaction costs   $ 14.6 $ 14.6