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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite-Lived Intangible Assets, Net $ 714.0      
Identifiable intangibles with indefinite useful lives 48.6      
Finite and Indefinite lived Intangible Assets, Additions 21.9 $ 17.3    
Adjustment for fully amortized intangibles (14.5) (9.4)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (2.2) 1.3    
Intangible Assets, Gross (Excluding Goodwill) 1,353.2 1,313.5 $ 1,348.0 $ 1,304.3
Identified intangibles, with finite useful lives, accumulated amortization (590.6) (480.4) (563.0) (445.8)
Amortization expense (42.7) (43.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 14.5 9.4    
Impact of exchange rate movements 0.6 (0.4)    
Net book value as of end of period 762.6 833.1 785.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 1.6 2.9    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 714.0      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 21.9 17.3    
Adjustment for fully amortized intangibles (5.3) (9.0)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 818.4 755.6 801.8 747.3
Identified intangibles, with finite useful lives, accumulated amortization (331.0) (259.3) (309.8) (242.2)
Amortization expense (26.5) (26.1)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 5.3 9.0    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 487.4 496.3    
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 (9.2) (0.4)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (2.2) 1.3    
Intangible Assets, Gross (Excluding Goodwill) 534.8 557.9 546.2 557.0
Identified intangibles, with finite useful lives, accumulated amortization (259.6) (221.1) $ (253.2) $ (203.6)
Amortization expense (16.2) (17.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 9.2 0.4    
Impact of exchange rate movements 0.6 (0.4)    
Net book value as of end of period $ 275.2 $ 336.8