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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investments, Fair Value Disclosure $ 792.8   $ 794.9 $ 786.7   $ 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 46.3   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 46.3   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 3.3   3.7      
Loans Receivable, Fair Value Disclosure 705.2   463.2      
Deferred compensation plan assets 590.3   517.9      
Mortgage banking derivative asset 0.0   0.0      
Total assets at fair value 1,298.8   984.8      
Foreign currency forward contracts payable 8.3   4.8      
Deferred compensation plan liabilities 540.4   485.4      
Business Combination, Contingent Consideration, Liability 0.0   0.0      
Mortgage banking derivative liabilities 0.0   0.0      
Total liabilities at fair value 548.7   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 30.9 $ 59.1 20.7 60.3 $ 21.6 21.9
Investments, Fair Value Disclosure 438.7 438.1 452.0 453.5 460.4 303.5
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 214.1   190.2      
Total assets at fair value 652.8   642.2      
Foreign currency forward contracts payable 0.0   0.0      
Deferred compensation plan liabilities 0.0   0.0      
Business Combination, Contingent Consideration, Liability 64.2 $ 64.3 73.2 $ 76.6 $ 74.9 $ 84.1
Mortgage banking derivative liabilities 183.2   169.5      
Total liabilities at fair value $ 247.4   $ 242.7