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Business Combinations Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 6 Months Ended 9 Months Ended
Jun. 30, 2016
Sep. 30, 2017
Sep. 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   $ 466.4 $ 468.6 $ 475.6 $ 366.2
Finite and Indefinite lived Intangible Assets, Additions   60.0 113.1    
Adjustment for fully amortized intangibles   (78.3)      
Impairment of Intangible Assets (Excluding Goodwill) $ (6.5)   (6.5)    
Finite And Indefinite Lived Intangible Assets Translation Adjustments   9.1 (4.2)    
Identified intangibles, with finite useful lives, accumulated amortization   (159.0) (169.1) (180.6) (139.0)
Amortization expense   53.2 33.8    
Accumulated Amortization Adjustment for fully Amortized Intangibles   78.3      
Impact of exchange rate movements   (3.5) 3.7    
Net book value as of end of period   307.4 299.5 295.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments   7.7      
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]          
2017 (3 months)   19.6      
2018   54.2      
2019   49.1      
2020   43.7      
2021   33.7      
2022   30.9      
Thereafter   67.4      
Total   298.6      
Reportable Subsegments [Member] | Americas [Member]          
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]          
Impairment of Intangible Assets (Excluding Goodwill) 0.0        
Reportable Subsegments [Member] | EMEA [Member]          
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]          
Impairment of Intangible Assets (Excluding Goodwill) 0.0        
Reportable Subsegments [Member] | Asia Pacific [Member]          
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]          
Impairment of Intangible Assets (Excluding Goodwill) 0.0        
Investment Management [Member]          
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]          
Impairment of Intangible Assets (Excluding Goodwill)     (6.5)    
Mortgage servicing rights [Member]          
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]          
2017 (3 months)   7.7      
2018   30.0      
2019   26.9      
2020   24.2      
2021   20.4      
2022   17.4      
Thereafter   55.1      
Total   181.7      
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   231.3 188.6 193.1 171.6
Finite and Indefinite lived Intangible Assets, Additions   50.7 17.0    
Adjustment for fully amortized intangibles   (12.5)      
Impairment of Intangible Assets (Excluding Goodwill) $ 0.0        
Finite And Indefinite Lived Intangible Assets Translation Adjustments   0.0 0.0    
Identified intangibles, with finite useful lives, accumulated amortization   (49.6) (26.4) (32.3) (8.6)
Amortization expense   29.8 17.8    
Accumulated Amortization Adjustment for fully Amortized Intangibles   12.5      
Impact of exchange rate movements   0.0 0.0    
Net book value as of end of period   181.7 162.2    
Other Intangible Assets [Member]          
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]          
2017 (3 months)   11.9      
2018   24.2      
2019   22.2      
2020   19.5      
2021   13.3      
2022   13.5      
Thereafter   12.3      
Total   116.9      
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   117.7 163.8 167.1 125.5
Finite and Indefinite lived Intangible Assets, Additions   0.4 38.6    
Adjustment for fully amortized intangibles   (50.0)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments   0.2 (0.3)    
Identified intangibles, with finite useful lives, accumulated amortization   (58.7) (95.7) (98.7) (88.4)
Amortization expense   10.3 7.7    
Accumulated Amortization Adjustment for fully Amortized Intangibles   50.0      
Impact of exchange rate movements   0.3 0.4    
Net book value as of end of period   59.0 68.1    
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   94.1 95.6 91.1 48.5
Finite and Indefinite lived Intangible Assets, Additions   3.1 51.8    
Adjustment for fully amortized intangibles   (7.7)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments   7.6 (4.7)    
Identified intangibles, with finite useful lives, accumulated amortization   (45.1) (36.1) (38.0) (32.6)
Amortization expense   11.2 7.0    
Accumulated Amortization Adjustment for fully Amortized Intangibles   7.7      
Impact of exchange rate movements   (3.6) 3.5    
Net book value as of end of period   49.0 59.5    
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   23.3 20.5 24.2 14.3
Finite and Indefinite lived Intangible Assets, Additions   5.8 5.7    
Adjustment for fully amortized intangibles   (8.0)      
Finite And Indefinite Lived Intangible Assets Translation Adjustments   1.3 0.5    
Identified intangibles, with finite useful lives, accumulated amortization   (5.6) (10.8) (11.5) (9.3)
Amortization expense   1.9 1.3    
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   17.7 9.7    
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 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 0.3    
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 $ 0.0