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Basis of Financial Statements - Corrections to Impacted Financial Statement (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]                
Income taxes receivable $ 47.2   $ 47.2   $ 48.8      
Total assets 1,258.4 $ 1,785.8 1,258.4 $ 1,785.8 1,308.9      
Retained earnings 3.4   3.4   11.5      
Total equity 911.9 1,356.7 911.9 1,356.7 979.1 $ 922.4 $ 1,696.7 $ 1,815.3
Income tax expense 1.7 (1.8) 2.2 18.4 24.8      
Net income (loss) 28.4 (240.5) (7.4) (355.5) (536.7)      
Net loss attributable to Cannae Holdings, Inc. common shareholders $ 37.5 $ (238.8) $ 5.4 $ (351.8) $ (525.0)      
Net loss per share (in usd per share) $ 0.86 $ (3.93) $ 0.12 $ (5.72) $ (9.29)      
Net loss per share (in usd per share) $ 0.86 $ (3.93) $ 0.12 $ (5.72) $ (9.29)      
As Reported                
Schedule of Equity Method Investments [Line Items]                
Income taxes receivable         $ 60.6      
Total assets         1,320.7      
Retained earnings         23.3      
Total equity         990.9      
Income tax expense         13.0      
Net income (loss)         (524.9)      
Net loss attributable to Cannae Holdings, Inc. common shareholders         $ (513.2)      
Net loss per share (in usd per share)         $ (9.08)      
Net loss per share (in usd per share)         $ (9.08)      
Correction                
Schedule of Equity Method Investments [Line Items]                
Income taxes receivable         $ (11.8)      
Total assets         (11.8)      
Retained earnings         (11.8)      
Total equity         (11.8)      
Income tax expense         11.8      
Net income (loss)         (11.8)      
Net loss attributable to Cannae Holdings, Inc. common shareholders         $ (11.8)      
Net loss per share (in usd per share)         $ (0.21)      
Net loss per share (in usd per share)         $ (0.21)