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Fair Value Of Assets And Liabilities - Fair Value Of Financial Instruments Held By Consolidated Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 1,333.0 $ 1,408.4 $ 987.1
Restricted cash   129.2  
Foreign time deposits 28.3 29.9  
Policyholder payables (3,415.2) (7,582.1)  
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 1,333.0 1,408.4  
Restricted cash 0.0 129.2  
Equity investments 444.9 360.3  
Foreign time deposits 28.3 29.9  
Assets held for policyholders 3,415.2 7,582.1  
Policyholder payables (3,415.2) (7,582.1)  
Contingent consideration liability $ (3.4) $ (18.6)