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Basis of Financial Statements - Change in Accounting Principle for Equity Method Investments (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Statement [Abstract]      
Income tax benefit $ (7.2) $ (5.5)  
Equity in earnings (losses) of unconsolidated affiliates (21.4) (1.1)  
Net earnings (loss) (19.9) (5.3)  
Net earnings (loss) attributable to Cannae Holdings $ (16.8) $ (1.1)  
Basic      
Basic earnings (loss) per share attributable to Cannae Holdings common shareholders (in usd per share) $ (0.23) $ (0.02)  
Diluted      
Diluted earnings (loss) per share attributable to Cannae Holdings common shareholders (in usd per share) $ (0.23) $ (0.02)  
Condensed Consolidated Statements of Comprehensive Earnings      
Net earnings (loss) $ (19.9) $ (5.3)  
Unrealized gain relating to investments in unconsolidated affiliates 5.9    
Comprehensive earnings (loss) attributable to Cannae Holdings, Inc. (10.5) $ (5.7)  
Balance Sheet Related Disclosures [Abstract]      
Investments in unconsolidated affiliates 906.3   $ 397.2
Deferred tax asset 18.2   16.9
Retained earnings 49.5   45.8
Additional paid-in capital 1,148.9   1,146.2
Accumulated other comprehensive loss (65.9)   $ (67.2)
As Previously Reported      
Income Statement [Abstract]      
Income tax benefit (4.8)    
Equity in earnings (losses) of unconsolidated affiliates 2.9    
Net earnings (loss) 2.0    
Net earnings (loss) attributable to Cannae Holdings $ 5.1    
Basic      
Basic earnings (loss) per share attributable to Cannae Holdings common shareholders (in usd per share) $ 0.07    
Diluted      
Diluted earnings (loss) per share attributable to Cannae Holdings common shareholders (in usd per share) $ 0.07    
Condensed Consolidated Statements of Comprehensive Earnings      
Net earnings (loss) $ 2.0    
Unrealized gain relating to investments in unconsolidated affiliates 6.2    
Comprehensive earnings (loss) attributable to Cannae Holdings, Inc. 11.7    
Balance Sheet Related Disclosures [Abstract]      
Investments in unconsolidated affiliates 930.8    
Deferred tax asset 15.8    
Retained earnings 71.4    
Additional paid-in capital 1,148.8    
Accumulated other comprehensive loss (65.6)    
Difference      
Income Statement [Abstract]      
Income tax benefit (2.4)    
Equity in earnings (losses) of unconsolidated affiliates (24.3)    
Net earnings (loss) (21.9)    
Net earnings (loss) attributable to Cannae Holdings $ (21.9)    
Basic      
Basic earnings (loss) per share attributable to Cannae Holdings common shareholders (in usd per share) $ (0.30)    
Diluted      
Diluted earnings (loss) per share attributable to Cannae Holdings common shareholders (in usd per share) $ (0.30)    
Condensed Consolidated Statements of Comprehensive Earnings      
Net earnings (loss) $ (21.9)    
Unrealized gain relating to investments in unconsolidated affiliates (0.3)    
Comprehensive earnings (loss) attributable to Cannae Holdings, Inc. (22.2)    
Balance Sheet Related Disclosures [Abstract]      
Investments in unconsolidated affiliates (24.5)    
Deferred tax asset 2.4    
Retained earnings (21.9)    
Additional paid-in capital 0.1    
Accumulated other comprehensive loss $ (0.3)