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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Fair Value Disclosure $ 825.5 $ 677.5 $ 794.9 $ 639.6
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 55.5   58.3  
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 0.0   0.0  
Total assets at fair value 55.5   58.3  
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 4.9   3.7  
Loans Receivable, Fair Value Disclosure 881.6   463.2  
Deferred compensation plan assets 551.3   517.9  
Mortgage banking derivative asset 0.0   0.0  
Total assets at fair value 1,437.8   984.8  
Foreign currency forward contracts payable 3.9   4.8  
Deferred compensation plan liabilities 507.9   485.4  
Business Combination, Contingent Consideration, Liability 0.0   0.0  
Mortgage banking derivative liabilities 0.0   0.0  
Total liabilities at fair value 511.8   490.2  
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 12.8 37.1 20.7 21.9
Investments, Fair Value Disclosure 466.5 344.2 452.0 303.5
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 155.2   190.2  
Total assets at fair value 621.7   642.2  
Foreign currency forward contracts payable 0.0   0.0  
Deferred compensation plan liabilities 0.0   0.0  
Business Combination, Contingent Consideration, Liability 73.1 79.5 73.2 $ 84.1
Mortgage banking derivative liabilities 142.4   169.5  
Total liabilities at fair value 215.5   $ 242.7  
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 4.9 17.2    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.5 0.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 9.1 23.5    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0.0 0.0    
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 (5.0) 20.4    
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 31.1 37.6    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (34.0) (42.8)    
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 0.0 (0.7)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0.2 (0.1)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0.0 2.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ (0.3) $ (5.8)