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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 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 $ 824.6      
Identifiable intangibles with indefinite useful lives 47.3      
Finite and Indefinite lived Intangible Assets, Additions 83.0 $ 65.7    
Adjustment for fully amortized intangibles 36.3 46.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (7.7) (1.6)    
Intangible Assets, Gross (Excluding Goodwill) 1,266.1 993.2 $ 1,227.1 $ 975.1
Identified intangibles, with finite useful lives, accumulated amortization (394.2) (320.7) (340.1) (295.3)
Amortization expense (92.5) (71.2)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (36.3) (46.0)    
Impact of exchange rate movements 2.1 0.2    
Net book value as of end of period 871.9 672.5 887.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 16.7 7.6    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 824.6      
Mortgage servicing rights [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 78.1 61.9    
Adjustment for fully amortized intangibles 33.8 17.2    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 714.0 616.8 669.7 572.1
Identified intangibles, with finite useful lives, accumulated amortization (216.0) (175.5) (191.0) (147.8)
Amortization expense (58.8) (44.9)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (33.8) (17.2)    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 498.0 441.3    
Other Intangible Assets [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 4.9 3.8    
Adjustment for fully amortized intangibles 2.5 28.8    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (7.7) (1.6)    
Intangible Assets, Gross (Excluding Goodwill) 552.1 376.4 557.4 403.0
Identified intangibles, with finite useful lives, accumulated amortization (178.2) (145.2) $ (149.1) $ (147.5)
Amortization expense (33.7) (26.3)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (2.5) (28.8)    
Impact of exchange rate movements 2.1 0.2    
Net book value as of end of period $ 373.9 $ 231.2