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FAIR VALUE OF ASSETS AND LIABILITIES - Fair Value of Financial Instruments Held by Consolidated Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 1,773.2 $ 1,408.4 $ 1,066.6
Restricted cash 0.0 129.2  
Foreign time deposits 29.1 29.9  
Total return swaps related to deferred compensation plans   5.1  
Policyholder payables (2,232.2) (7,582.1)  
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 1,773.2 1,408.4  
Restricted cash 0.0 129.2  
Equity investments 324.3 360.3  
Foreign time deposits 29.1 29.9  
Assets held for policyholders 2,232.2 7,582.1  
Policyholder payables (2,232.2) (7,582.1)  
Contingent consideration liability (3.4) (18.6)  
Fair Value | Total Return Swap      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total return swaps related to deferred compensation plans   $ 5.1  
Total return swaps related to deferred compensation plans $ (8.2)