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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Fair Value Disclosure $ 435.4 $ 302.0 $ 340.3 $ 328.6
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 72.6   77.2  
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 72.6   77.2  
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 6.9   13.1  
Loans Receivable, Fair Value Disclosure 832.1   1,529.2  
Deferred compensation plan assets 480.2   446.3  
Mortgage banking derivative asset 0.0   0.0  
Total assets at fair value 1,319.2   1,988.6  
Foreign currency forward contracts payable 9.4   3.4  
Deferred compensation plan liabilities 452.0   427.6  
Business Combination, Contingent Consideration, Liability 0.0   0.0  
Mortgage banking derivative liabilities 0.0   0.0  
Total liabilities at fair value 461.4   431.0  
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 32.9 (64.0) 13.7 10.2
Investments, Fair Value Disclosure 140.1 41.4 59.3 34.4
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 63.9   87.1  
Total assets at fair value 204.0   146.4  
Foreign currency forward contracts payable 0.0   0.0  
Deferred compensation plan liabilities 0.0   0.0  
Business Combination, Contingent Consideration, Liability 68.2 130.0 85.7 $ 148.5
Mortgage banking derivative liabilities 31.0   73.4  
Total liabilities at fair value 99.2   $ 159.1  
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 31.8 0.0    
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 49.1 7.0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ (0.1) $ 0.0