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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount $ 470.9 $ 475.6 $ 366.2
Additions, net of adjustments 75.9 126.0  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   (6.5)  
Adjustment for fully amortized intangibles (90.2)    
Impact of exchange rate movements 9.6 (10.1)  
Identified intangibles, with finite useful lives, accumulated amortization (165.9) (180.6) (139.0)
Amortization expense (3) (71.8) (47.8)  
Accumulated Amortization Adjustment for fully Amortized Intangibles (90.2)    
Impact of exchange rate movements 3.7 (6.2)  
Net book value as of end of period 305.0 295.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 10.8    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2018 58.9    
2019 51.9    
2020 44.9    
2021 34.3    
2022 25.4    
Thereafter 80.8    
Total $ 296.2    
Mortgage servicing rights [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 6 months 15 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2018 $ 31.0    
2019 28.2    
2020 25.7    
2021 21.9    
2022 18.9    
Thereafter 61.0    
Total 186.7    
Mortgage servicing rights [Member] | Reportable Subsegments [Member] | Americas [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount 241.8 193.1 171.6
Additions, net of adjustments 66.6 21.5  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   0.0  
Adjustment for fully amortized intangibles (17.9)    
Impact of exchange rate movements 0.0 0.0  
Identified intangibles, with finite useful lives, accumulated amortization (55.1) (32.3) (8.6)
Amortization expense (3) (40.7) (23.7)  
Accumulated Amortization Adjustment for fully Amortized Intangibles (17.9)    
Impact of exchange rate movements 0.0 0.0  
Net book value as of end of period $ 186.7    
Other Intangible Assets [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 10 months 14 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2018 $ 27.9    
2019 23.7    
2020 19.2    
2021 12.4    
2022 6.5    
Thereafter 19.8    
Total 109.5    
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Americas [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount 117.0 167.1 125.5
Additions, net of adjustments 0.4 41.8  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   0.0  
Adjustment for fully amortized intangibles (50.7)    
Impact of exchange rate movements 0.2 (0.2)  
Identified intangibles, with finite useful lives, accumulated amortization (61.3) (98.7) (88.4)
Amortization expense (3) (13.7) (10.8)  
Accumulated Amortization Adjustment for fully Amortized Intangibles (50.7)    
Impact of exchange rate movements (0.4) (0.5)  
Net book value as of end of period 55.7    
Other Intangible Assets [Member] | Reportable Subsegments [Member] | EMEA [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount 88.8 91.1 48.5
Additions, net of adjustments 3.1 52.5  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   0.0  
Adjustment for fully amortized intangibles (13.6)    
Impact of exchange rate movements 8.2 (9.9)  
Identified intangibles, with finite useful lives, accumulated amortization (43.1) (38.0) (32.6)
Amortization expense (3) (14.8) (11.0)  
Accumulated Amortization Adjustment for fully Amortized Intangibles (13.6)    
Impact of exchange rate movements 3.9 (5.6)  
Net book value as of end of period 45.7    
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount 23.3 24.2 14.3
Additions, net of adjustments 5.8 10.2  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   0.0  
Adjustment for fully amortized intangibles (7.9)    
Impact of exchange rate movements 1.2 (0.3)  
Identified intangibles, with finite useful lives, accumulated amortization (6.4) (11.5) (9.3)
Amortization expense (3) (2.6) (2.3)  
Accumulated Amortization Adjustment for fully Amortized Intangibles (7.9)    
Impact of exchange rate movements 0.2 (0.1)  
Net book value as of end of period 16.9    
Other Intangible Assets [Member] | LaSalle [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount 0.0 0.1 6.3
Additions, net of adjustments 0.0 0.0  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   (6.5)  
Adjustment for fully amortized intangibles (0.1)    
Impact of exchange rate movements 0.0 0.3  
Identified intangibles, with finite useful lives, accumulated amortization 0.0 (0.1) $ (0.1)
Amortization expense (3) 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