v3.25.2
Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite-Lived Intangible Assets, Net $ 630.0      
Identifiable intangibles with indefinite useful lives 52.0      
Finite and Indefinite lived Intangible Assets, Additions 41.1 $ 49.1    
Adjustment for fully amortized intangibles (25.7) (24.8)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 10.0 (2.5)    
Intangible Assets, Gross (Excluding Goodwill) 1,420.3 1,369.8 $ 1,394.9 $ 1,348.0
Identified intangibles, with finite useful lives, accumulated amortization (738.3) (625.9) (670.8) (563.0)
Amortization expense (89.4) (88.3)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 25.7 24.8    
Impact of exchange rate movements (3.8) 0.6    
Net book value as of end of period 682.0 743.9 724.1  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 2.3 4.2    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 630.0      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 40.6 34.2    
Adjustment for fully amortized intangibles (24.5) (15.5)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 867.2 820.5 851.1 801.8
Identified intangibles, with finite useful lives, accumulated amortization (410.9) (349.7) (380.0) (309.8)
Amortization expense (55.4) (55.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 24.5 15.5    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 456.3 470.8    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 0.5 14.9    
Adjustment for fully amortized intangibles (1.2) (9.3)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 10.0 (2.5)    
Intangible Assets, Gross (Excluding Goodwill) 553.1 549.3 543.8 546.2
Identified intangibles, with finite useful lives, accumulated amortization (327.4) (276.2) $ (290.8) $ (253.2)
Amortization expense (34.0) (32.9)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 1.2 9.3    
Impact of exchange rate movements (3.8) 0.6    
Net book value as of end of period $ 225.7 $ 273.1