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Business Acquisition - Estimated Useful Lives of Assets Acquired (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 15, 2020
Mar. 31, 2020
Sep. 30, 2020
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Estimated Life (in Years)   5 years  
Collateral Analytics and DocVerify      
Acquired Finite-Lived Intangible Assets [Line Items]      
Computer software     $ 8.2
Other intangible assets     18.1
Total gross carrying value     26.3
Collateral Analytics and DocVerify | Client relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets     $ 16.4
Weighted Average Estimated Life (in Years)     10 years
Collateral Analytics and DocVerify | Trade names      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets     $ 1.1
Weighted Average Estimated Life (in Years)     3 years
Collateral Analytics and DocVerify | Non-compete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets     $ 0.6
Weighted Average Estimated Life (in Years)     4 years
Collateral Analytics and DocVerify | Computer software      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Estimated Life (in Years)     5 years
Optimal Blue Holdco, LLC      
Acquired Finite-Lived Intangible Assets [Line Items]      
Computer software $ 79.8    
Other intangible assets 610.0    
Total gross carrying value 689.8    
Optimal Blue Holdco, LLC | Client relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets $ 601.7    
Weighted Average Estimated Life (in Years) 10 years    
Optimal Blue Holdco, LLC | Trade names      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets $ 5.2    
Weighted Average Estimated Life (in Years) 3 years    
Optimal Blue Holdco, LLC | Non-compete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets $ 3.1    
Weighted Average Estimated Life (in Years) 5 years    
Optimal Blue Holdco, LLC | Computer software      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Estimated Life (in Years) 5 years