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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount $ 475.6 $ 366.2 $ 163.7
Additions, net of adjustments 126.0 206.0  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) (6.5)    
Impact of exchange rate movements (10.1) (3.5)  
Identified intangibles, with finite useful lives, accumulated amortization (180.6) (139.0) (124.9)
Amortization expense (47.8) (16.6)  
Impact of exchange rate movements 6.2 2.5  
Net book value as of end of period 295.0 227.2  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2017 59.0    
2018 48.8    
2019 43.3    
2020 37.4    
2021 27.9    
Thereafter 69.8    
Total 286.2    
LaSalle [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ (6.5)    
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 4 months 15 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2017 $ 32.1    
2018 25.1    
2019 21.6    
2020 18.2    
2021 14.8    
Thereafter 49.0    
Total 160.8    
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 193.1 171.6 8.6
Additions, net of adjustments 21.5 163.0  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0.0    
Impact of exchange rate movements 0.0 0.0  
Identified intangibles, with finite useful lives, accumulated amortization (32.3) (8.6) (2.8)
Amortization expense (23.7) (5.8)  
Impact of exchange rate movements 0.0 0.0  
Net book value as of end of period 160.8    
Other Intangible Assets [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0.0    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 3 months 19 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2017 $ 26.9    
2018 23.7    
2019 21.7    
2020 19.2    
2021 13.1    
Thereafter 20.8    
Total 125.4    
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 167.1 125.5 94.8
Additions, net of adjustments 41.8 30.8  
Impact of exchange rate movements (0.2) (0.1)  
Identified intangibles, with finite useful lives, accumulated amortization (98.7) (88.4) (82.1)
Amortization expense (10.8) (6.3)  
Impact of exchange rate movements 0.5 0.0  
Net book value as of end of period 68.4    
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 91.1 48.5 43.8
Additions, net of adjustments 52.5 6.9  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0.0    
Impact of exchange rate movements (9.9) (2.2)  
Identified intangibles, with finite useful lives, accumulated amortization (38.0) (32.6) (31.0)
Amortization expense (11.0) (3.8)  
Impact of exchange rate movements 5.6 2.2  
Net book value as of end of period 53.1    
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 24.2 14.3 9.5
Additions, net of adjustments 10.2 5.3  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0.0    
Impact of exchange rate movements (0.3) (0.5)  
Identified intangibles, with finite useful lives, accumulated amortization (11.5) (9.3) (8.9)
Amortization expense (2.3) (0.7)  
Impact of exchange rate movements 0.1 0.3  
Net book value as of end of period 12.7    
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 0.1 6.3 7.0
Additions, net of adjustments 0.0 0.0  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) (6.5)    
Impact of exchange rate movements 0.3 (0.7)  
Identified intangibles, with finite useful lives, accumulated amortization (0.1) (0.1) $ (0.1)
Amortization expense 0.0 0.0  
Impact of exchange rate movements 0.0 $ 0.0  
Net book value as of end of period $ 0.0