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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite And Indefinite Lived Intangible Assets Gross     $ 470.9 $ 475.6
Finite and Indefinite lived Intangible Assets, Additions $ 42.5 $ 60.0    
Adjustment for fully amortized intangibles (55.8) (78.3)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (5.0) 9.1    
Intangible Assets, Gross (Excluding Goodwill) 452.6 466.4    
Identified intangibles, with finite useful lives, accumulated amortization (161.1) (159.0) (165.9) (180.6)
Amortization expense (53.8) (53.2)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 55.8 78.3    
Impact of exchange rate movements 2.8 (3.5)    
Net book value as of end of period 291.5 307.4 305.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 8.7 7.7    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (3 months) 16.4      
2019 54.0      
2020 47.6      
2021 37.8      
2022 29.0      
2023 23.4      
Thereafter 74.5      
Total 282.7      
Mortgage servicing rights [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (3 months) 6.7      
2019 30.3      
2020 28.4      
2021 25.4      
2022 22.5      
2023 19.1      
Thereafter 58.9      
Total 191.3      
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     241.8 193.1
Finite and Indefinite lived Intangible Assets, Additions 36.8 50.7    
Adjustment for fully amortized intangibles (17.2) (12.5)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 261.4 231.3    
Identified intangibles, with finite useful lives, accumulated amortization (70.1) (49.6) (55.1) (32.3)
Amortization expense (32.2) (29.8)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 17.2 12.5    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 191.3 181.7    
Other Intangible Assets [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (3 months) 9.7      
2019 23.7      
2020 19.2      
2021 12.4      
2022 6.5      
2023 4.3      
Thereafter 15.6      
Total 91.4      
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     117.0 167.1
Finite and Indefinite lived Intangible Assets, Additions 3.6 0.4    
Adjustment for fully amortized intangibles (36.2) (50.0)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.3 0.2    
Intangible Assets, Gross (Excluding Goodwill) 84.7 117.7    
Identified intangibles, with finite useful lives, accumulated amortization (35.3) (58.7) (61.3) (98.7)
Amortization expense (10.2) (10.3)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 36.2 50.0    
Impact of exchange rate movements 0.0 0.3    
Net book value as of end of period 49.4 59.0    
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     88.8 91.1
Finite and Indefinite lived Intangible Assets, Additions 0.0 3.1    
Adjustment for fully amortized intangibles (1.7) (7.7)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (3.3) 7.6    
Intangible Assets, Gross (Excluding Goodwill) 83.8 94.1    
Identified intangibles, with finite useful lives, accumulated amortization (49.1) (45.1) (43.1) (38.0)
Amortization expense (9.5) (11.2)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 1.7 7.7    
Impact of exchange rate movements 1.8 (3.6)    
Net book value as of end of period 34.7 49.0    
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     23.3 24.2
Finite and Indefinite lived Intangible Assets, Additions 2.1 5.8    
Adjustment for fully amortized intangibles (0.7) (8.0)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (2.0) 1.3    
Intangible Assets, Gross (Excluding Goodwill) 22.7 23.3    
Identified intangibles, with finite useful lives, accumulated amortization (6.6) (5.6) (6.4) (11.5)
Amortization expense (1.9) (1.9)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.7 8.0    
Impact of exchange rate movements 1.0 (0.2)    
Net book value as of end of period 16.1 17.7    
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     0.0 0.1
Finite and Indefinite lived Intangible Assets, Additions 0.0 0.0    
Adjustment for fully amortized intangibles 0.0 (0.1)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 0.0 0.0    
Identified intangibles, with finite useful lives, accumulated amortization 0.0 0.0 $ 0.0 $ (0.1)
Amortization expense 0.0 0.0    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0 0.1    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period $ 0.0 $ 0.0