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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 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 $ 695.6      
Identifiable intangibles with indefinite useful lives 48.3      
Finite and Indefinite lived Intangible Assets, Additions 49.1 $ 51.3    
Adjustment for fully amortized intangibles (24.8) (37.6)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (2.5) 2.1    
Intangible Assets, Gross (Excluding Goodwill) 1,369.8 1,320.1 $ 1,348.0 $ 1,304.3
Identified intangibles, with finite useful lives, accumulated amortization (625.9) (499.0) (563.0) (445.8)
Amortization expense (88.3) (90.1)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 24.8 37.6    
Impact of exchange rate movements 0.6 (0.7)    
Net book value as of end of period 743.9 821.1 785.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 4.2 6.8    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 695.6      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 34.2 45.5    
Adjustment for fully amortized intangibles (15.5) (20.2)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 820.5 772.6 801.8 747.3
Identified intangibles, with finite useful lives, accumulated amortization (349.7) (276.5) (309.8) (242.2)
Amortization expense (55.4) (54.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 15.5 20.2    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 470.8 496.1    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 14.9 5.8    
Adjustment for fully amortized intangibles (9.3) (17.4)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (2.5) 2.1    
Intangible Assets, Gross (Excluding Goodwill) 549.3 547.5 546.2 557.0
Identified intangibles, with finite useful lives, accumulated amortization (276.2) (222.5) $ (253.2) $ (203.6)
Amortization expense (32.9) (35.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 9.3 17.4    
Impact of exchange rate movements 0.6 (0.7)    
Net book value as of end of period $ 273.1 $ 325.0