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Business Acquisition - Estimated Useful Lives of Assets Acquired (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Mar. 03, 2020
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Estimated Life (in Years)   5 years  
Collateral Analytics      
Acquired Finite-Lived Intangible Assets [Line Items]      
Computer software     $ 6.4
Other intangible assets     17.9
Total gross carrying value     24.3
Collateral Analytics | Client relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets     16.7
Weighted Average Estimated Life (in Years) 10 years    
Collateral Analytics | Trade names      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets     0.3
Weighted Average Estimated Life (in Years) 3 years    
Collateral Analytics | Non-compete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Other intangible assets     $ 0.9
Weighted Average Estimated Life (in Years) 3 years    
Collateral Analytics | Computer software      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted Average Estimated Life (in Years) 5 years