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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Document Period End Date Sep. 30, 2021      
Finite and Indefinite lived Intangible Assets, Additions $ 115.0 $ 78.4    
Adjustment for fully amortized intangibles 82.2 45.4    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (4.3) (0.5)    
Intangible Assets, Gross (Excluding Goodwill) 1,003.6 930.9 $ 975.1 $ 897.4
Identified intangibles, with finite useful lives, accumulated amortization (323.0) (277.0) (295.3) (214.8)
Amortization expense (110.6) (108.8)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (82.2) (45.4)    
Impact of exchange rate movements 0.7 (1.2)    
Net book value as of end of period 680.6 653.9 679.8  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 15.4 15.3    
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs   1.9    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 629.1      
Identifiable intangibles with indefinite useful lives 51.5      
Mortgage servicing rights [Member] | Americas [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 95.5 77.9    
Adjustment for fully amortized intangibles 36.2 30.9    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 631.4 527.4 572.1 480.4
Identified intangibles, with finite useful lives, accumulated amortization (183.5) (138.6) (147.8) (104.0)
Amortization expense (71.9) (65.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (36.2) (30.9)    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 447.9 388.8    
Other Intangible Assets [Member] | Americas [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 15.7 0.0    
Adjustment for fully amortized intangibles 11.4 14.1    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.2    
Intangible Assets, Gross (Excluding Goodwill) 270.1 271.4 265.8 285.7
Identified intangibles, with finite useful lives, accumulated amortization (113.8) (88.8) (94.1) (68.3)
Amortization expense (31.1) (35.0)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (11.4) (14.1)    
Impact of exchange rate movements 0.0 0.4    
Net book value as of end of period 156.3 182.6    
Other Intangible Assets [Member] | EMEA [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 3.8 0.0    
Adjustment for fully amortized intangibles 29.9 0.4    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (0.7) 1.5    
Intangible Assets, Gross (Excluding Goodwill) 28.9 54.0 55.7 55.9
Identified intangibles, with finite useful lives, accumulated amortization (14.5) (37.0) (39.5) (33.1)
Amortization expense (5.3) (5.2)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (29.9) (0.4)    
Impact of exchange rate movements 0.4 (0.9)    
Net book value as of end of period 14.4 17.0    
Other Intangible Assets [Member] | Asia Pacific [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite and Indefinite lived Intangible Assets, Additions 0.0 0.5    
Adjustment for fully amortized intangibles 4.7 0.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (1.1) (0.3)    
Intangible Assets, Gross (Excluding Goodwill) 17.8 22.2 23.6 21.4
Identified intangibles, with finite useful lives, accumulated amortization (4.6) (7.9) (8.6) (6.7)
Amortization expense (1.0) (1.1)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (4.7) 0.0    
Impact of exchange rate movements 0.3 0.1    
Net book value as of end of period 13.2 14.3    
Other Intangible Assets [Member] | Investment Management [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 0.0 0.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (2.5) (1.9)    
Intangible Assets, Gross (Excluding Goodwill) 55.4 55.9 57.9 54.0
Identified intangibles, with finite useful lives, accumulated amortization (6.6) (4.7) $ (5.3) $ (2.7)
Amortization expense (1.3) (2.0)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0 0.0    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period $ 48.8 $ 51.2