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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite And Indefinite Lived Intangible Assets Gross     $ 506.7 $ 470.9
Finite and Indefinite lived Intangible Assets, Additions $ 18.2 $ 11.3    
Adjustment for fully amortized intangibles 4.4 1.9    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 1.3 3.0    
Intangible Assets, Gross (Excluding Goodwill) 521.8 483.3    
Identified intangibles, with finite useful lives, accumulated amortization (183.1) (183.2) (169.8) (165.9)
Amortization expense (17.3) (17.8)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (4.4) (1.9)    
Impact of exchange rate movements 0.4 (1.4)    
Net book value as of end of period 338.7 300.1 336.9  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 1.9 2.7    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (3 months) 50.9      
2019 50.5      
2020 40.9      
2021 32.4      
2022 26.6      
2023 22.1      
Thereafter 66.0      
Total 289.4      
Mortgage servicing rights [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (3 months) 23.2      
2019 29.5      
2020 26.9      
2021 24.0      
2022 20.7      
2023 18.1      
Thereafter 49.8      
Total 192.2      
Mortgage servicing rights [Member] | Reportable Subsegments [Member] | Americas [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite And Indefinite Lived Intangible Assets Gross     266.2 241.8
Finite and Indefinite lived Intangible Assets, Additions 8.1 10.7    
Adjustment for fully amortized intangibles 4.4 1.9    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 269.9 250.6    
Identified intangibles, with finite useful lives, accumulated amortization (77.7) (63.6) (72.4) (55.1)
Amortization expense (9.7) (10.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles (4.4) (1.9)    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 192.2 187.0    
Other Intangible Assets [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (3 months) 27.7      
2019 21.0      
2020 14.0      
2021 8.4      
2022 5.9      
2023 4.0      
Thereafter 16.2      
Total 97.2      
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Americas [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite And Indefinite Lived Intangible Assets Gross     90.0 117.0
Finite and Indefinite lived Intangible Assets, Additions 0.9 0.6    
Adjustment for fully amortized intangibles 0.0 0.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.1 0.0    
Intangible Assets, Gross (Excluding Goodwill) 91.0 117.6    
Identified intangibles, with finite useful lives, accumulated amortization (42.4) (64.6) (38.8) (61.3)
Amortization expense (3.6) (3.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0 0.0    
Impact of exchange rate movements 0.0 (0.1)    
Net book value as of end of period 48.6 53.0    
Other Intangible Assets [Member] | Reportable Subsegments [Member] | EMEA [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite And Indefinite Lived Intangible Assets Gross     83.1 88.8
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 1.0 3.1    
Intangible Assets, Gross (Excluding Goodwill) 84.1 91.9    
Identified intangibles, with finite useful lives, accumulated amortization (54.9) (47.9) (51.8) (43.1)
Amortization expense (2.7) (3.3)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0 0.0    
Impact of exchange rate movements 0.4 (1.5)    
Net book value as of end of period 29.2 44.0    
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite And Indefinite Lived Intangible Assets Gross     23.5 23.3
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 0.2 (0.1)    
Intangible Assets, Gross (Excluding Goodwill) 23.7 23.2    
Identified intangibles, with finite useful lives, accumulated amortization (7.4) (7.1) (6.8) (6.4)
Amortization expense (0.6) (0.7)    
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 16.3 16.1    
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 Gross     43.9 0.0
Finite and Indefinite lived Intangible Assets, Additions 9.2 0.0    
Adjustment for fully amortized intangibles 0.0 0.0    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 53.1 0.0    
Identified intangibles, with finite useful lives, accumulated amortization (0.7) 0.0 $ 0.0 $ 0.0
Amortization expense (0.7) 0.0    
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 $ 52.4 $ 0.0