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Discontinued Operations - Net Losses from Discontinued Operations, Net of Tax in our Statements of Operations (Details) - USD ($)
$ 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
Disposal Group, Including Discontinued Operations [Line Items]          
Operating income $ (56.8) $ (60.9) $ (78.9) $ (82.3)  
Net loss 28.4 (240.5) (7.4) (355.5) $ (536.7)
Net income attributable to noncontrolling interest (9.1) (1.7) (12.8) (3.7)  
Net loss attributable to D&B $ 37.5 (238.8) $ 5.4 (351.8) $ (525.0)
Discontinued Operations, Held-for-Sale or Disposed of by Sale | Dun And Bradstreet Corporation          
Disposal Group, Including Discontinued Operations [Line Items]          
Total revenues   585.2   1,165.0  
Operating income   12.8   48.1  
Loss before income taxes   (34.0)   (48.8)  
Net loss   (32.6)   (47.4)  
Net income attributable to noncontrolling interest   1.1   2.1  
Net loss attributable to D&B   $ (33.7)   $ (49.5)