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Basis of Financial Statements - Revision of Prior Period Financial Statements (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]                    
Adjustment for cumulative effect of adoption of accounting standard               $ 15,500,000 $ 1,900,000  
Depreciation and amortization           $ (40,100,000) $ (45,300,000)      
Income tax expense (benefit) $ 15,600,000 $ 5,900,000 $ (7,200,000) $ (900,000) $ (1,300,000) 14,300,000 (3,800,000)      
Net earnings (loss) (41,600,000) (18,900,000) 19,900,000 8,100,000 1,000,000.0 (40,600,000) 35,800,000      
Restatement Adjustment                    
Schedule of Equity Method Investments [Line Items]                    
Income tax expense (benefit)   (2,600,000) (2,400,000)   (5,000,000.0)          
Net earnings (loss)   $ (3,900,000) $ 21,900,000   $ 18,000,000.0          
Retained Earnings                    
Schedule of Equity Method Investments [Line Items]                    
Adjustment for cumulative effect of adoption of accounting standard               $ 20,500,000 $ 1,900,000  
Net earnings (loss) $ (46,200,000)     (1,500,000)   $ (52,800,000) 19,400,000      
Decrease To other operating revenue | Restatement Adjustment                    
Schedule of Equity Method Investments [Line Items]                    
Other operating revenue       0     3,100,000      
Decrease to depreciation and amortization | Restatement Adjustment                    
Schedule of Equity Method Investments [Line Items]                    
Depreciation and amortization       600,000     1,600,000      
Increase to income tax benefit | Restatement Adjustment                    
Schedule of Equity Method Investments [Line Items]                    
Income tax expense (benefit)       200,000     (1,500,000)      
Increase To Net Loss And Net Loss Attributable to Cannae | Restatement Adjustment                    
Schedule of Equity Method Investments [Line Items]                    
Net earnings (loss)       400,000     $ 0      
Increase To Net Loss Per Share | Restatement Adjustment                    
Schedule of Equity Method Investments [Line Items]                    
Net loss per share (in usd per share)             $ 0      
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Retained Earnings                    
Schedule of Equity Method Investments [Line Items]                    
Adjustment for cumulative effect of adoption of accounting standard       1,900,000     $ 1,900,000     $ 4,300,000
T-System | ASU 2014-09 | Adjustments for error corrections to prior interim periods of current year | Retained Earnings                    
Schedule of Equity Method Investments [Line Items]                    
Decrease in cumulative effect of adoption of ASC Topic 606       $ 2,400,000     $ 2,400,000