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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Investments, Fair Value Disclosure $ 795.5 $ 792.8 $ 795.5 $ 792.8   $ 740.8   $ 794.9
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 48.4   48.4     51.7    
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 48.4   48.4     51.7    
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 11.9   11.9     12.5    
Loans Receivable, Fair Value Disclosure 2,055.9   2,055.9     677.4    
Deferred compensation plan assets 672.2   672.2     604.3    
Mortgage banking derivative asset 0.0   0.0     0.0    
Total assets at fair value 2,740.0   2,740.0     1,294.2    
Foreign currency forward contracts payable 9.1   9.1     8.8    
Deferred compensation plan liabilities 645.9   645.9     576.1    
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 655.0   655.0     584.9    
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 25.7 30.9 25.7 30.9 $ 31.7 10.3 $ 59.1 20.7
Investments, Fair Value Disclosure 378.8 64.2 378.8 64.2 367.8 367.3 438.1 452.0
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 126.8   126.8     128.0    
Total assets at fair value 505.6   505.6     495.3    
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 35.2 438.7 35.2 438.7 $ 53.7 57.5 $ 64.3 $ 73.2
Mortgage banking derivative liabilities 101.1   101.1     117.7    
Total liabilities at fair value 136.3   136.3     $ 175.2    
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 9.5 (2.0) (0.9) (101.0)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 1.5 (1.0) 1.2 0.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0 0.5 2.8 20.6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   3.1 8.4 66.9        
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 17.3 18.0 45.5 56.9        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.0 0.0 0.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 32.8 25.3 78.9 93.8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (56.1) (71.5) (109.0) (140.5)        
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 (20.9) 0.1 (33.5) (0.5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.2 (0.1) 0.2 0.1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2.4 0.0 13.4 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ (0.2) (0.1) (2.2) (8.6)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3   $ 0.0 $ (0.2) $ 0.0