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Business Combinations, Goodwill and Other Intangible Assets, Business Combinations Activity (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
acquisition
Dec. 31, 2022
USD ($)
acquisition
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]      
Payment for Contingent Consideration Liability, Total $ 26.8 $ 18.1  
Number of Businesses Acquired | acquisition 1    
Goodwill, acquired during period $ 18.7    
Finite-lived intangible assets acquired 2.1    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 2.8    
Number of acquisitions subject to potential earn-out payments provisions | acquisition 14 17  
Business Combination, Contingent Consideration Arrangements, Range of OUtcomes, High, Value $ 100.0 $ 114.6  
Business Combination, Contingent Consideration, Liability, Current 19.6 23.1  
Other Payments to Acquire Businesses 10.0    
Payments to Acquire Businesses, Net of Cash Acquired 13.6 5.7 $ 416.8
Business Combination, Contingent Consideration, Liability, Noncurrent 51.1 76.3  
Goodwill 4,587.4 4,528.0 4,611.6
Goodwill Additions, net of adjustments 18.7 13.5  
Goodwill, Foreign Currency Translation Gain (Loss) 41.3 (97.1)  
Identified intangibles, net of accumulated amortization 785.0 858.5  
Servicing Asset at Amortized Cost, Other than Temporary Impairments 10.0 28.0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability, Current 12.0 5.0  
Business Combination, Contingent Consideration, Liability, Noncurrent 45.5 68.3  
Business Combination, Contingent Consideration, Liability $ 57.5 $ 73.2 $ 84.1