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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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
Additions, net of adjustments (1) $ 107.0 75.9  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     (6.5)
Adjustment for fully amortized intangibles (64.4) (90.2)  
Impact of exchange rate movements (6.8) (9.6)  
Intangible Assets, Gross (Excluding Goodwill) 506.7    
Identified intangibles, with finite useful lives, accumulated amortization (169.8) (165.9) (180.6)
Amortization expense, net (2) (72.2) (71.8)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 64.4 90.2  
Impact of exchange rate movements 3.9 3.7  
Net book value as of end of period 336.9 305.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 11.4 10.8  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2018 55.9    
2019 49.9    
2020 40.3    
2021 31.9    
2022 26.0    
Thereafter 83.7    
Total $ 287.7    
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 22 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2018 $ 30.7    
2019 28.9    
2020 26.3    
2021 23.5    
2022 20.1    
Thereafter 64.3    
Total 193.8    
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     193.1
Additions, net of adjustments (1) 49.9 66.6  
Adjustment for fully amortized intangibles (25.5) (17.9)  
Impact of exchange rate movements 0.0 0.0  
Intangible Assets, Gross (Excluding Goodwill) 266.2 241.8  
Identified intangibles, with finite useful lives, accumulated amortization (72.4) (55.1) (32.3)
Amortization expense, net (2) (42.8) (40.7)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 25.5 17.9  
Impact of exchange rate movements 0.0 0.0  
Net book value as of end of period $ 193.8    
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 18 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2018 $ 25.2    
2019 21.0    
2020 14.0    
2021 8.4    
2022 5.9    
Thereafter 19.4    
Total 93.9    
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
Additions, net of adjustments (1) 9.1 0.4  
Adjustment for fully amortized intangibles (36.2) (50.7)  
Impact of exchange rate movements (0.1) (0.2)  
Intangible Assets, Gross (Excluding Goodwill) 90.0    
Identified intangibles, with finite useful lives, accumulated amortization (38.8) (61.3) (98.7)
Amortization expense, net (2) (14.0) (13.7)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 36.2 50.7  
Impact of exchange rate movements 0.3 0.4  
Net book value as of end of period 51.2    
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
Additions, net of adjustments (1) 0.3 3.1  
Adjustment for fully amortized intangibles (1.7) (13.6)  
Impact of exchange rate movements (4.3) (8.2)  
Intangible Assets, Gross (Excluding Goodwill) 83.1    
Identified intangibles, with finite useful lives, accumulated amortization (51.8) (43.1) (38.0)
Amortization expense, net (2) (12.8) (14.8)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 1.7 13.6  
Impact of exchange rate movements 2.4 3.9  
Net book value as of end of period 31.3    
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
Additions, net of adjustments (1) 3.8 5.8  
Adjustment for fully amortized intangibles (1.0) (7.9)  
Impact of exchange rate movements (2.6) (1.2)  
Intangible Assets, Gross (Excluding Goodwill) 23.5    
Identified intangibles, with finite useful lives, accumulated amortization (6.8) (6.4) (11.5)
Amortization expense, net (2) (2.6) (2.6)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 1.0 7.9  
Impact of exchange rate movements 1.2 0.2  
Net book value as of end of period 16.7    
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
Additions, net of adjustments (1) 43.9 0.0  
Adjustment for fully amortized intangibles 0.0 (0.1)  
Impact of exchange rate movements 0.0 0.0  
Intangible Assets, Gross (Excluding Goodwill) 43.9    
Identified intangibles, with finite useful lives, accumulated amortization 0.0 0.0 $ (0.1)
Amortization expense, net (2) 0.0 0.0  
Accumulated Amortization Adjustment for fully Amortized Intangibles 0.0 0.1  
Impact of exchange rate movements 0.0 $ 0.0  
Net book value as of end of period $ 43.9