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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 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 $ 619.3      
Identifiable intangibles with indefinite useful lives 52.1      
Finite and Indefinite lived Intangible Assets, Additions 72.6 $ 67.5    
Adjustment for fully amortized intangibles (259.1) (35.2)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 9.7 1.8    
Intangible Assets, Gross (Excluding Goodwill) 1,218.1 1,382.1 $ 1,394.9 $ 1,348.0
Identified intangibles, with finite useful lives, accumulated amortization (546.7) (661.0) (670.8) (563.0)
Amortization expense (131.3) (132.1)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 259.1 35.2    
Impact of exchange rate movements (3.7) (1.1)    
Net book value as of end of period 671.4 721.1 724.1  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 5.8 6.0    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 619.3      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 72.1 52.0    
Adjustment for fully amortized intangibles (41.0) (25.3)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 882.2 828.5 851.1 801.8
Identified intangibles, with finite useful lives, accumulated amortization (426.4) (367.1) (380.0) (309.8)
Amortization expense (87.4) (82.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 41.0 25.3    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 455.8 461.4    
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 15.5    
Adjustment for fully amortized intangibles (218.1) (9.9)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 9.7 1.8    
Intangible Assets, Gross (Excluding Goodwill) 335.9 553.6 543.8 546.2
Identified intangibles, with finite useful lives, accumulated amortization (120.3) (293.9) $ (290.8) $ (253.2)
Amortization expense (43.9) (49.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 218.1 9.9    
Impact of exchange rate movements (3.7) (1.1)    
Net book value as of end of period $ 215.6 $ 259.7