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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite-Lived Intangible Assets, Net $ 671.2      
Identifiable intangibles with indefinite useful lives 49.9      
Finite and Indefinite lived Intangible Assets, Additions 67.5 $ 78.3    
Adjustment for fully amortized intangibles (35.2) (46.0)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 1.8 (1.0)    
Intangible Assets, Gross (Excluding Goodwill) 1,382.1 1,335.6 $ 1,348.0 $ 1,304.3
Identified intangibles, with finite useful lives, accumulated amortization (661.0) (532.4) (563.0) (445.8)
Amortization expense (132.1) (132.9)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 35.2 46.0    
Impact of exchange rate movements (1.1) 0.3    
Net book value as of end of period 721.1 803.2 785.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 6.0 8.4    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 671.2      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 52.0 72.5    
Adjustment for fully amortized intangibles (25.3) (25.7)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 828.5 794.1 801.8 747.3
Identified intangibles, with finite useful lives, accumulated amortization (367.1) (296.6) (309.8) (242.2)
Amortization expense (82.6) (80.1)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 25.3 25.7    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 461.4 497.5    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 15.5 5.8    
Adjustment for fully amortized intangibles (9.9) (20.3)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 1.8 (1.0)    
Intangible Assets, Gross (Excluding Goodwill) 553.6 541.5 546.2 557.0
Identified intangibles, with finite useful lives, accumulated amortization (293.9) (235.8) $ (253.2) $ (203.6)
Amortization expense (49.5) (52.8)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 9.9 20.3    
Impact of exchange rate movements (1.1) 0.3    
Net book value as of end of period $ 259.7 $ 305.7