v3.26.1
Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Intangible Asset, Finite-Lived, after Accumulated Amortization $ 584.8      
Identifiable intangibles with indefinite useful lives 50.9      
Finite and Indefinite lived Intangible Assets, Additions 51.4 $ 41.1    
Adjustment for fully amortized intangibles (25.6) (25.7)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (0.8) 10.0    
Intangible Asset, Excluding Goodwill, before Accumulated Amortization 1,245.5 1,420.3 $ 1,232.8 $ 1,394.9
Identified intangibles, with finite useful lives, accumulated amortization (609.8) (738.3) (566.1) (670.8)
Amortization expense (74.2) (89.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 25.6 25.7    
Impact of exchange rate movements (0.1) (3.8)    
Net book value as of end of period 635.7 682.0 666.7  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 4.2 2.3    
Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Abstract]        
Total 584.8      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 43.8 40.6    
Adjustment for fully amortized intangibles (25.3) (24.5)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Asset, Excluding Goodwill, before Accumulated Amortization 915.3 867.2 896.8 851.1
Identified intangibles, with finite useful lives, accumulated amortization (474.2) (410.9) (438.6) (380.0)
Amortization expense (60.9) (55.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 25.3 24.5    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 441.1 456.3    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 7.6 0.5    
Adjustment for fully amortized intangibles (0.3) (1.2)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (0.8) 10.0    
Intangible Asset, Excluding Goodwill, before Accumulated Amortization 330.2 553.1 336.0 543.8
Identified intangibles, with finite useful lives, accumulated amortization (135.6) (327.4) $ (127.5) $ (290.8)
Amortization expense (13.3) (34.0)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.3 1.2    
Impact of exchange rate movements (0.1) (3.8)    
Net book value as of end of period $ 194.6 $ 225.7