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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Document Period End Date Mar. 31, 2021      
Finite and Indefinite lived Intangible Assets, Additions $ 43.8 $ 17.4    
Adjustment for fully amortized intangibles 17.7 12.9    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (1.9) 7.1    
Intangible Assets, Gross (Excluding Goodwill) 999.3 894.8 $ 975.1 $ 897.4
Identified intangibles, with finite useful lives, accumulated amortization (312.3) (236.1) (295.3) (214.8)
Amortization expense (34.6) (37.1)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (17.7) (12.9)    
Net book value as of end of period 687.0 658.7 679.8  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 3.1 5.9    
Impact of exchange rate movements (0.1) (2.9)    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 634.9      
Identifiable intangibles with indefinite useful lives 52.1      
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 40.0 16.9    
Adjustment for fully amortized intangibles 6.7 12.7    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 605.4 484.6 572.1 480.4
Identified intangibles, with finite useful lives, accumulated amortization (162.7) (113.9) (147.8) (104.0)
Amortization expense (21.6) (22.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (6.7) (12.7)    
Net book value as of end of period 442.7 370.7    
Impact of exchange rate movements 0.0 0.0    
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 0.0 0.0    
Adjustment for fully amortized intangibles 7.9 0.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.1 0.5    
Intangible Assets, Gross (Excluding Goodwill) 258.0 285.2 265.8 285.7
Identified intangibles, with finite useful lives, accumulated amortization (96.7) (79.7) (94.1) (68.3)
Amortization expense (10.5) (11.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (7.9) 0.0    
Net book value as of end of period 161.3 205.5    
Impact of exchange rate movements 0.0 0.2    
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 0.9 0.2    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.2 3.4    
Intangible Assets, Gross (Excluding Goodwill) 58.8 52.3 55.7 55.9
Identified intangibles, with finite useful lives, accumulated amortization (40.5) (32.6) (39.5) (33.1)
Amortization expense (1.8) (1.8)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (0.9) (0.2)    
Net book value as of end of period 18.3 19.7    
Impact of exchange rate movements (0.1) (2.1)    
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 2.2 0.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (0.4) 2.1    
Intangible Assets, Gross (Excluding Goodwill) 21.0 19.8 23.6 21.4
Identified intangibles, with finite useful lives, accumulated amortization (6.6) (6.6) (8.6) (6.7)
Amortization expense (0.3) (0.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (2.2) 0.0    
Net book value as of end of period 14.4 13.2    
Impact of exchange rate movements 0.1 (0.5)    
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 (1.8) 1.1    
Intangible Assets, Gross (Excluding Goodwill) 56.1 52.9 57.9 54.0
Identified intangibles, with finite useful lives, accumulated amortization (5.8) (3.3) $ (5.3) $ (2.7)
Amortization expense (0.4) (0.7)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0 0.0    
Net book value as of end of period 50.3 49.6    
Impact of exchange rate movements $ (0.1) $ (0.1)