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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite-Lived Intangible Assets, Net $ 772.1      
Identifiable intangibles with indefinite useful lives 49.0      
Finite and Indefinite lived Intangible Assets, Additions 51.3 $ 83.0    
Adjustment for fully amortized intangibles 37.6 36.3    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 2.1 (7.7)    
Intangible Assets, Gross (Excluding Goodwill) 1,320.1 1,266.1 $ 1,304.3 $ 1,227.1
Identified intangibles, with finite useful lives, accumulated amortization (499.0) (394.2) (445.8) (340.1)
Amortization expense (90.1) (92.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (37.6) (36.3)    
Impact of exchange rate movements (0.7) 2.1    
Net book value as of end of period 821.1 871.9 858.5  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 6.8 16.7    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 772.1      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 45.5 78.1    
Adjustment for fully amortized intangibles 20.2 33.8    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 772.6 714.0 747.3 669.7
Identified intangibles, with finite useful lives, accumulated amortization (276.5) (216.0) (242.2) (191.0)
Amortization expense (54.5) (58.8)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (20.2) (33.8)    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 496.1 498.0    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 5.8 4.9    
Adjustment for fully amortized intangibles 17.4 2.5    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 2.1 (7.7)    
Intangible Assets, Gross (Excluding Goodwill) 547.5 552.1 557.0 557.4
Identified intangibles, with finite useful lives, accumulated amortization (222.5) (178.2) $ (203.6) $ (149.1)
Amortization expense (35.6) (33.7)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (17.4) (2.5)    
Impact of exchange rate movements (0.7) 2.1    
Net book value as of end of period $ 325.0 $ 373.9