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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Fair Value Disclosure $ 856.0 $ 743.8 $ 742.0 $ 740.8
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Fair Value Disclosure 44.0   43.8  
Foreign currency forward contracts receivable 0.0   0.0  
Loans Receivable, Fair Value Disclosure 0.0   0.0  
Deferred compensation plan assets 0.0   0.0  
Mortgage banking derivative asset 0.0   0.0  
Total assets at fair value 44.0   43.8  
Foreign currency forward contracts payable 0.0   0.0  
Deferred compensation plan liabilities 0.0   0.0  
Business Combination, Contingent Consideration, Liability 0.0   0.0  
Mortgage banking derivative liabilities 0.0   0.0  
Total liabilities at fair value 0.0   0.0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Fair Value Disclosure 0.0   0.0  
Foreign currency forward contracts receivable 2.5   4.9  
Loans Receivable, Fair Value Disclosure 601.6   770.7  
Deferred compensation plan assets 673.4   664.0  
Mortgage banking derivative asset 0.0   0.0  
Total assets at fair value 1,277.5   1,439.6  
Foreign currency forward contracts payable 4.1   13.9  
Deferred compensation plan liabilities 644.5   658.4  
Business Combination, Contingent Consideration, Liability 0.0   0.0  
Mortgage banking derivative liabilities 0.0   0.0  
Total liabilities at fair value 648.6   672.3  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net 16.7 18.9 93.8 10.3
Investments, Fair Value Disclosure 311.0 369.7 330.3 367.3
Foreign currency forward contracts receivable 0.0   0.0  
Loans Receivable, Fair Value Disclosure 0.0   0.0  
Deferred compensation plan assets 0.0   0.0  
Mortgage banking derivative asset 71.4   161.1  
Total assets at fair value 382.4   491.4  
Foreign currency forward contracts payable 0.0   0.0  
Deferred compensation plan liabilities 0.0   0.0  
Business Combination, Contingent Consideration, Liability 37.5 46.7 35.8 $ 57.5
Mortgage banking derivative liabilities 54.7   67.3  
Total liabilities at fair value 92.2   $ 103.1  
Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (19.9) (1.1)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.7 (0.2)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0 0.5    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (0.1) 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0.0 3.2    
Derivative [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 7.3 8.7    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.0 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 30.0 23.8    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (114.4) (23.9)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0.0 0.0    
Earn-out Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 3.9 (10.5)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.1 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (0.1) (0.3)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 $ (2.2) $ 0.0