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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 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 $ 483.3 $ 437.7 $ 470.9 $ 475.6
Finite and Indefinite lived Intangible Assets, Additions 11.3 29.5    
Adjustment for fully amortized intangibles (1.9)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 3.0 1.8    
Identified intangibles, with finite useful lives, accumulated amortization (183.2) (129.5) (165.9) (180.6)
Amortization expense (17.8) (17.4)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 1.9 69.2    
Impact of exchange rate movements (1.4) (0.7)    
Net book value as of end of period 300.1 308.2 305.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 2.7      
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (9 months) 44.6      
2019 53.0      
2020 46.1      
2021 35.5      
2022 26.7      
2023 20.9      
Thereafter 64.5      
Total 291.3      
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 (9 months) 22.4      
2019 29.2      
2020 26.8      
2021 23.0      
2022 20.1      
2023 16.6      
Thereafter 48.9      
Total 187.0      
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 250.6 209.7 241.8 193.1
Finite and Indefinite lived Intangible Assets, Additions 10.7 20.0    
Adjustment for fully amortized intangibles (1.9)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Identified intangibles, with finite useful lives, accumulated amortization (63.6) (38.7) (55.1) (32.3)
Amortization expense (10.4) (9.8)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 1.9 3.4    
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 187.0 171.0    
Other Intangible Assets [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2018 (9 months) 22.2      
2019 23.8      
2020 19.3      
2021 12.5      
2022 6.6      
2023 4.3      
Thereafter 15.6      
Total 104.3      
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 117.6 117.3 117.0 167.1
Finite and Indefinite lived Intangible Assets, Additions 0.6 0.2    
Adjustment for fully amortized intangibles 0.0      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Identified intangibles, with finite useful lives, accumulated amortization (64.6) (52.1) (61.3) (98.7)
Amortization expense (3.4) (3.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0      
Impact of exchange rate movements 0.1 0.1    
Net book value as of end of period 53.0 65.2    
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 91.9 87.0 88.8 91.1
Finite and Indefinite lived Intangible Assets, Additions 0.0 2.4    
Adjustment for fully amortized intangibles 0.0      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 3.1 1.2    
Identified intangibles, with finite useful lives, accumulated amortization (47.9) (34.5) (43.1) (38.0)
Amortization expense (3.3) (3.5)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0      
Impact of exchange rate movements (1.5) (0.7)    
Net book value as of end of period 44.0 52.5    
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 23.2 23.7 23.3 24.2
Finite and Indefinite lived Intangible Assets, Additions 0.0 6.9    
Adjustment for fully amortized intangibles 0.0      
Finite And Indefinite Lived Intangible Assets Translation Adjustments (0.1) 0.6    
Identified intangibles, with finite useful lives, accumulated amortization (7.1) (4.2) (6.4) (11.5)
Amortization expense (0.7) (0.6)    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0      
Impact of exchange rate movements 0.0 (0.1)    
Net book value as of end of period 16.1 19.5    
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 Gross 0.0 0.0 0.0 0.1
Finite and Indefinite lived Intangible Assets, Additions 0.0 0.0    
Adjustment for fully amortized intangibles 0.0      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 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