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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Investments, Fair Value Disclosure $ 744.7 $ 802.5 $ 744.7 $ 802.5   $ 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 44.2   44.2     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 44.2   44.2     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 1.4   1.4     12.5    
Loans Receivable, Fair Value Disclosure 642.4   642.4     677.4    
Deferred compensation plan assets 639.8   639.8     604.3    
Mortgage banking derivative asset 0.0   0.0     0.0    
Total assets at fair value 1,283.6   1,283.6     1,294.2    
Foreign currency forward contracts payable 5.1   5.1     8.8    
Deferred compensation plan liabilities 613.6   613.6     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 618.7   618.7     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 31.7 59.1 31.7 59.1 $ 18.9 10.3 $ 12.8 20.7
Investments, Fair Value Disclosure 367.8 64.3 367.8 64.3 369.7 367.3 466.5 452.0
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 152.3   152.3     128.0    
Total assets at fair value 520.1   520.1     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 53.7 438.1 53.7 438.1 $ 46.7 57.5 $ 73.1 $ 73.2
Mortgage banking derivative liabilities 120.6   120.6     117.7    
Total liabilities at fair value 174.3   174.3     $ 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 (9.3) (103.9) (10.4) (99.0)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (0.1) 0.7 (0.3) 1.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2.3 11.0 2.8 20.1        
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 5.2 63.8 8.4 63.8        
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 19.5 43.9 28.2 38.9        
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 22.3 37.4 46.1 68.5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (29.0) (35.0) (52.9) (69.0)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0.0 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 (2.1) (0.6) (12.6) (0.6)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.0 0.0 0.0 0.2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 11.0 0.0 11.0 0.0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1.7) (8.2) (2.0) (8.5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 $ (0.2) $ 0.0 $ (0.2) $ 0.0