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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Additions, net of adjustments $ 119.2 $ 101.8  
Adjustment for fully amortized intangibles (66.9) (61.4)  
Impact of exchange rate movements (5.4) 3.3  
Intangible Assets, Gross (Excluding Goodwill) 1,394.9 1,348.0 $ 1,304.3
Identified intangibles, with finite useful lives, accumulated amortization (670.8) (563.0) (445.8)
Amortization expense, net (1) (176.2) (177.7)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 66.9 61.4  
Impact of exchange rate movements 1.5 (0.9)  
Net book value as of end of period 724.1 785.0  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 7.7 10.0  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2025 152.1    
2026 115.7    
2027 98.8    
2028 83.4    
2029 66.5    
Thereafter 160.6    
Total 677.1    
Mortgage servicing rights [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Additions, net of adjustments 89.0 94.6  
Adjustment for fully amortized intangibles (39.7) (40.1)  
Impact of exchange rate movements 0.0 0.0  
Intangible Assets, Gross (Excluding Goodwill) 851.1 801.8 747.3
Identified intangibles, with finite useful lives, accumulated amortization (380.0) (309.8) (242.2)
Amortization expense, net (1) (109.9) (107.7)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 39.7 40.1  
Impact of exchange rate movements 0.0 0.0  
Net book value as of end of period $ 471.1 492.0  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 7 months 6 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2025 $ 102.2    
2026 90.0    
2027 79.1    
2028 65.0    
2029 48.8    
Thereafter 86.0    
Total 471.1    
Other Intangible Assets [Member]      
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]      
Additions, net of adjustments 30.2 7.2  
Adjustment for fully amortized intangibles (27.2) (21.3)  
Impact of exchange rate movements (5.4) 3.3  
Intangible Assets, Gross (Excluding Goodwill) 543.8 546.2 557.0
Identified intangibles, with finite useful lives, accumulated amortization (290.8) (253.2) $ (203.6)
Amortization expense, net (1) (66.3) (70.0)  
Accumulated Amortization Adjustment for fully Amortized Intangibles 27.2 21.3  
Impact of exchange rate movements 1.5 $ (0.9)  
Net book value as of end of period $ 253.0    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 7 months 6 days    
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
2025 $ 49.9    
2026 25.7    
2027 19.7    
2028 18.4    
2029 17.7    
Thereafter 74.6    
Total $ 206.0