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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Additions, net of adjustments (1) $ 160.2 $ 371.3  
Adjustment for fully amortized intangibles (76.8) (114.0)  
Impact of exchange rate movements (6.2) (5.3)  
Intangible Assets, Gross (Excluding Goodwill) 1,304.3 1,227.1 $ 975.1
Identified intangibles, with finite useful lives, accumulated amortization (445.8) (340.1) (295.3)
Amortization expense, net (2) (184.8) (159.9)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 76.8 114.0  
Impact of exchange rate movements 2.3 (1.1)  
Net book value as of end of period 858.5 887.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 28.0 31.2  
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)   (0.1)  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2023 159.1    
2024 147.9    
2025 118.4    
2026 81.5    
2027 66.7    
Thereafter 236.7    
Total 810.3    
Mortgage servicing rights [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Additions, net of adjustments (1) 140.9 161.1  
Adjustment for fully amortized intangibles (63.3) (63.5)  
Impact of exchange rate movements 0.0 0.0  
Intangible Assets, Gross (Excluding Goodwill) 747.3 669.7 572.1
Identified intangibles, with finite useful lives, accumulated amortization (242.2) (191.0) (147.8)
Amortization expense, net (2) (114.5) (106.7)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 63.3 63.5  
Impact of exchange rate movements 0.0 0.0  
Net book value as of end of period $ 505.1 478.7  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 1 month 6 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2023 $ 91.2    
2024 85.3    
2025 76.4    
2026 63.1    
2027 52.0    
Thereafter 137.1    
Total 505.1    
Other Intangible Assets [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Additions, net of adjustments (1) 19.3 210.2  
Adjustment for fully amortized intangibles (13.5) (50.5)  
Impact of exchange rate movements (6.2) (5.3)  
Intangible Assets, Gross (Excluding Goodwill) 557.0 557.4 403.0
Identified intangibles, with finite useful lives, accumulated amortization (203.6) (149.1) $ (147.5)
Amortization expense, net (2) (70.3) (53.2)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 13.5 50.5  
Impact of exchange rate movements 2.3 $ 1.1  
Net book value as of end of period $ 353.4    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 7 months 6 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2023 $ 67.9    
2024 62.6    
2025 42.0    
2026 18.4    
2027 14.7    
Thereafter 99.6    
Total $ 305.2