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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 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 $ 26.0 $ 38.1    
Adjustment for fully amortized intangibles (14.3) (71.8)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (3.5) 5.7    
Intangible Assets, Gross (Excluding Goodwill) 479.1 447.6    
Identified intangibles, with finite useful lives, accumulated amortization (186.3) (145.6) (165.9) (180.6)
Amortization expense (36.8) (34.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 14.3 71.8    
Impact of exchange rate movements 2.1 (2.2)    
Net book value as of end of period 292.8 302.0 305.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 6.5 4.3    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (6 months) 29.6      
2019 53.0      
2020 46.3      
2021 36.2      
2022 27.5      
2023 22.0      
Thereafter 69.4      
Total 284.0      
Reportable Subsegments [Member] | Americas [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Accumulated Amortization Adjustment for fully Amortized Intangibles   50.0    
Reportable Subsegments [Member] | EMEA [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Accumulated Amortization Adjustment for fully Amortized Intangibles   7.7    
Reportable Subsegments [Member] | Asia Pacific [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Accumulated Amortization Adjustment for fully Amortized Intangibles   8.0    
Investment Management [Member]        
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Accumulated Amortization Adjustment for fully Amortized Intangibles   0.1    
Mortgage servicing rights [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (6 months) 15.8      
2019 29.3      
2020 27.1      
2021 23.8      
2022 21.0      
2023 17.7      
Thereafter 53.8      
Total 188.5      
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 24.0 29.0    
Adjustment for fully amortized intangibles (11.9) (6.0)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Intangible Assets, Gross (Excluding Goodwill) 253.9 216.1    
Identified intangibles, with finite useful lives, accumulated amortization (65.4) (45.2) (55.1) (32.3)
Amortization expense (22.2) (18.9)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 11.9 6.0    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 188.5 170.9    
Other Intangible Assets [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (6 months) 13.8      
2019 23.7      
2020 19.2      
2021 12.4      
2022 6.5      
2023 4.3      
Thereafter 15.6      
Total 95.5      
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 0.6 0.2    
Adjustment for fully amortized intangibles (0.4) (50.0)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (0.1) 0.0    
Intangible Assets, Gross (Excluding Goodwill) 117.1 117.3    
Identified intangibles, with finite useful lives, accumulated amortization (67.5) (55.4) (61.3) (98.7)
Amortization expense (6.9) (6.9)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.4      
Impact of exchange rate movements 0.3 0.2    
Net book value as of end of period 49.6 61.9    
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 (1.3) (7.7)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (1.9) 4.8    
Intangible Assets, Gross (Excluding Goodwill) 85.6 91.3    
Identified intangibles, with finite useful lives, accumulated amortization (47.3) (40.1) (43.1) (38.0)
Amortization expense (6.4) (7.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 1.3      
Impact of exchange rate movements 0.9 (2.2)    
Net book value as of end of period 38.3 51.2    
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 1.4 5.8    
Adjustment for fully amortized intangibles (0.7) (8.0)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments (1.5) 0.9    
Intangible Assets, Gross (Excluding Goodwill) 22.5 22.9    
Identified intangibles, with finite useful lives, accumulated amortization (6.1) (4.9) (6.4) (11.5)
Amortization expense (1.3) (1.2)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.7      
Impact of exchange rate movements 0.9 (0.2)    
Net book value as of end of period 16.4 18.0    
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      
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period $ 0.0 $ 0.0