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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]        
Finite And Indefinite Lived Intangible Assets Gross $ 447.6 $ 390.3 $ 475.6 $ 366.2
Finite and Indefinite lived Intangible Assets, Additions 38.1 27.1    
Adjustment for fully amortized intangibles (71.8)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 5.7 (3.0)    
Identified intangibles, with finite useful lives, accumulated amortization (145.6) (156.6) (180.6) (139.0)
Amortization expense 34.6 20.3    
Accumulated Amortization Adjustment for fully Amortized Intangibles 71.8      
Impact of exchange rate movements (2.2) 2.7    
Net book value as of end of period 302.0 233.7 295.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 4.3      
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2017 (6 months) 32.3      
2018 52.6      
2019 47.3      
2020 41.3      
2021 31.5      
2022 28.7      
Thereafter 59.5      
Total 293.2      
Mortgage servicing rights [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2017 (6 months) 14.9      
2018 28.4      
2019 25.1      
2020 21.8      
2021 18.2      
2022 15.2      
Thereafter 47.3      
Total 170.9      
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 216.1 177.9 193.1 171.6
Finite and Indefinite lived Intangible Assets, Additions 29.0 6.3    
Adjustment for fully amortized intangibles (6.0)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.0    
Identified intangibles, with finite useful lives, accumulated amortization (45.2) (20.0) (32.3) (8.6)
Amortization expense 18.9 11.4    
Accumulated Amortization Adjustment for fully Amortized Intangibles 6.0      
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period 170.9 157.9    
Other Intangible Assets [Member]        
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
2017 (6 months) 17.4      
2018 24.2      
2019 22.2      
2020 19.5      
2021 13.3      
2022 13.5      
Thereafter 12.2      
Total 122.3      
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 117.3 138.3 167.1 125.5
Finite and Indefinite lived Intangible Assets, Additions 0.2 13.0    
Adjustment for fully amortized intangibles (50.0)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 (0.2)    
Identified intangibles, with finite useful lives, accumulated amortization (55.4) (92.3) (98.7) (88.4)
Amortization expense 6.9 4.2    
Accumulated Amortization Adjustment for fully Amortized Intangibles 50.0      
Impact of exchange rate movements 0.2 0.3    
Net book value as of end of period 61.9 46.0    
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 91.3 51.8 91.1 48.5
Finite and Indefinite lived Intangible Assets, Additions 3.1 6.6    
Adjustment for fully amortized intangibles (7.7)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 4.8 (3.3)    
Identified intangibles, with finite useful lives, accumulated amortization (40.1) (34.0) (38.0) (32.6)
Amortization expense 7.6 4.0    
Accumulated Amortization Adjustment for fully Amortized Intangibles 7.7      
Impact of exchange rate movements (2.2) 2.6    
Net book value as of end of period 51.2 17.8    
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 22.9 15.8 24.2 14.3
Finite and Indefinite lived Intangible Assets, Additions 5.8 1.2    
Adjustment for fully amortized intangibles (8.0)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.9 0.3    
Identified intangibles, with finite useful lives, accumulated amortization (4.9) (10.2) (11.5) (9.3)
Amortization expense 1.2 0.7    
Accumulated Amortization Adjustment for fully Amortized Intangibles 8.0      
Impact of exchange rate movements (0.2) (0.2)    
Net book value as of end of period 18.0 5.6    
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 6.5 0.1 6.3
Finite and Indefinite lived Intangible Assets, Additions 0.0 0.0    
Adjustment for fully amortized intangibles (0.1)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments 0.0 0.2    
Identified intangibles, with finite useful lives, accumulated amortization 0.0 (0.1) $ (0.1) $ (0.1)
Amortization expense 0.0 0.0    
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.1      
Impact of exchange rate movements 0.0 0.0    
Net book value as of end of period $ 0.0 $ 6.4