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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite-Lived Intangible Assets, Net $ 816.7      
Identifiable intangibles with indefinite useful lives 44.9      
Finite and Indefinite lived Intangible Assets, Additions 122.4 $ 115.0    
Adjustment for fully amortized intangibles 50.6 82.2    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (13.7) (4.3)    
Intangible Assets, Gross (Excluding Goodwill) 1,285.2 1,003.6 $ 1,227.1 $ 975.1
Identified intangibles, with finite useful lives, accumulated amortization (423.6) (323.0) (340.1) (295.3)
Amortization expense (138.2) (110.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (50.6) (82.2)    
Impact of exchange rate movements 4.1 0.7    
Net book value as of end of period 861.6 680.6 887.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 22.5 15.4    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 816.7      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 103.3 95.5    
Adjustment for fully amortized intangibles 47.9 36.2    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 725.1 631.4 669.7 572.1
Identified intangibles, with finite useful lives, accumulated amortization (229.8) (183.5) (191.0) (147.8)
Amortization expense (86.7) (71.9)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (47.9) (36.2)    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 495.3 447.9    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 19.1 19.5    
Adjustment for fully amortized intangibles 2.7 46.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (13.7) (4.3)    
Intangible Assets, Gross (Excluding Goodwill) 560.1 372.2 557.4 403.0
Identified intangibles, with finite useful lives, accumulated amortization (193.8) (139.5) $ (149.1) $ (147.5)
Amortization expense (51.5) (38.7)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (2.7) (46.0)    
Impact of exchange rate movements 4.1 0.7    
Net book value as of end of period $ 366.3 $ 232.7