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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Document Period End Date Jun. 30, 2021      
Finite and Indefinite lived Intangible Assets, Additions $ 65.7 $ 43.5    
Adjustment for fully amortized intangibles 46.0 26.7    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (1.6) 4.4    
Intangible Assets, Gross (Excluding Goodwill) 993.2 909.8 $ 975.1 $ 897.4
Identified intangibles, with finite useful lives, accumulated amortization (320.7) (256.9) (295.3) (214.8)
Amortization expense (71.2) (71.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (46.0) (26.7)    
Impact of exchange rate movements (0.2) (2.6)    
Net book value as of end of period 672.5 652.9 679.8  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 7.6 9.3    
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs   2.8    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Total 620.0      
Identifiable intangibles with indefinite useful lives 52.5      
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 61.9 43.0    
Adjustment for fully amortized intangibles 17.2 20.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 616.8 503.4 572.1 480.4
Identified intangibles, with finite useful lives, accumulated amortization (175.5) (126.5) (147.8) (104.0)
Amortization expense (44.9) (42.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (17.2) (20.0)    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 441.3 376.9    
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 9.0 6.2    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.4    
Intangible Assets, Gross (Excluding Goodwill) 256.8 279.1 265.8 285.7
Identified intangibles, with finite useful lives, accumulated amortization (105.9) (85.2) (94.1) (68.3)
Amortization expense (20.7) (23.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (9.0) (6.2)    
Impact of exchange rate movements (0.1) 0.3    
Net book value as of end of period 150.9 193.9    
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 16.1 0.5    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.3 3.5    
Intangible Assets, Gross (Excluding Goodwill) 43.7 51.9 55.7 55.9
Identified intangibles, with finite useful lives, accumulated amortization (27.6) (33.9) (39.5) (33.1)
Amortization expense (4.0) (3.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (16.1) (0.5)    
Impact of exchange rate movements (0.2) (2.2)    
Net book value as of end of period 16.1 18.0    
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 3.7 0.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (0.5) 0.4    
Intangible Assets, Gross (Excluding Goodwill) 19.4 21.5 23.6 21.4
Identified intangibles, with finite useful lives, accumulated amortization (5.5) (7.3) (8.6) (6.7)
Amortization expense (0.7) (0.7)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (3.7) 0.0    
Impact of exchange rate movements 0.1 (0.1)    
Net book value as of end of period 13.9 14.2    
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 (1.4) 0.1    
Intangible Assets, Gross (Excluding Goodwill) 56.5 53.9 57.9 54.0
Identified intangibles, with finite useful lives, accumulated amortization (6.2) (4.0) $ (5.3) $ (2.7)
Amortization expense (0.9) (1.3)    
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 $ 50.3 $ 49.9