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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite-Lived Intangible Assets, Net $ 653.2      
Identifiable intangibles with indefinite useful lives 48.6      
Finite and Indefinite lived Intangible Assets, Additions 20.2 $ 21.9    
Adjustment for fully amortized intangibles (11.7) (14.5)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 2.7 (2.2)    
Intangible Assets, Gross (Excluding Goodwill) 1,406.1 1,353.2 $ 1,394.9 $ 1,348.0
Identified intangibles, with finite useful lives, accumulated amortization (704.3) (590.6) (670.8) (563.0)
Amortization expense (44.2) (42.7)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 11.7 14.5    
Impact of exchange rate movements (1.0) 0.6    
Net book value as of end of period 701.8 762.6 724.1  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 0.8 1.6    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 653.2      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 20.2 21.9    
Adjustment for fully amortized intangibles (11.7) (5.3)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 859.6 818.4 851.1 801.8
Identified intangibles, with finite useful lives, accumulated amortization (395.5) (331.0) (380.0) (309.8)
Amortization expense (27.2) (26.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 11.7 5.3    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 464.1 487.4    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 0.0 0.0    
Adjustment for fully amortized intangibles 0.0 (9.2)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 2.7 (2.2)    
Intangible Assets, Gross (Excluding Goodwill) 546.5 534.8 543.8 546.2
Identified intangibles, with finite useful lives, accumulated amortization (308.8) (259.6) $ (290.8) $ (253.2)
Amortization expense (17.0) (16.2)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0 9.2    
Impact of exchange rate movements (1.0) 0.6    
Net book value as of end of period $ 237.7 $ 275.2