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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Investments, Fair Value Disclosure $ 844.7 $ 795.5 $ 844.7 $ 795.5   $ 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 45.9   45.9     43.8    
Foreign currency forward contracts receivable 0.0   0.0     0.0    
Loans Receivable, Fair Value Disclosure 0.0   0.0     0.0    
Deferred compensation plan assets 0.0   0.0     0.0    
Mortgage banking derivative asset 0.0   0.0     0.0    
Total assets at fair value 45.9   45.9     43.8    
Foreign currency forward contracts payable 0.0   0.0     0.0    
Deferred compensation plan liabilities 0.0   0.0     0.0    
Business Combination, Contingent Consideration, Liability 0.0   0.0     0.0    
Mortgage banking derivative liabilities 0.0   0.0     0.0    
Total liabilities at fair value 0.0   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     0.0    
Foreign currency forward contracts receivable 0.6   0.6     4.9    
Loans Receivable, Fair Value Disclosure 1,014.7   1,014.7     770.7    
Deferred compensation plan assets 716.0   716.0     664.0    
Mortgage banking derivative asset 0.0   0.0     0.0    
Total assets at fair value 1,731.3   1,731.3     1,439.6    
Foreign currency forward contracts payable 6.9   6.9     13.9    
Deferred compensation plan liabilities 699.0   699.0     658.4    
Business Combination, Contingent Consideration, Liability 0.0   0.0     0.0    
Mortgage banking derivative liabilities 0.0   0.0     0.0    
Total liabilities at fair value 705.9   705.9     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 14.7 25.7 14.7 25.7 $ 19.9 93.8 $ 31.7 10.3
Investments, Fair Value Disclosure 309.0 378.8 309.0 378.8 293.1 330.3 367.8 367.3
Foreign currency forward contracts receivable 0.0   0.0     0.0    
Loans Receivable, Fair Value Disclosure 0.0   0.0     0.0    
Deferred compensation plan assets 0.0   0.0     0.0    
Mortgage banking derivative asset 43.1   43.1     161.1    
Total assets at fair value 352.1   352.1     491.4    
Foreign currency forward contracts payable 0.0   0.0     0.0    
Deferred compensation plan liabilities 0.0   0.0     0.0    
Business Combination, Contingent Consideration, Liability 16.1 35.2 16.1 35.2 $ 19.1 35.8 $ 53.7 $ 57.5
Mortgage banking derivative liabilities 28.4   28.4     67.3    
Total liabilities at fair value 44.5   44.5     $ 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 15.4 9.5 (29.8) (0.9)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (0.3) 1.5 1.8 1.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.8 0.0 6.8 2.8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.0 0.0 (0.1) 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0.0 0.0 0.0 8.4        
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 3.4 17.3 20.4 45.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 52.9 32.8 117.8 78.9        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (61.5) (56.1) (217.3) (109.0)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0.0 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 0.4 (20.9) (3.1) (33.5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (0.1) 0.2 0.3 0.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0 2.4 0.2 13.4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (3.3) (0.2) (15.4) (2.2)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 $ 0.0 $ 0.0 $ (1.7) $ (0.2)