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Commitments and Contingencies (Narrative) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Total contractually obligated investments  
Contractual Obligation Additional Investment in Alternative or Other Investments $ 259.8
Alternative and Other Investments  
Contractual Obligation Additional Investment in Alternative or Other Investments 215.7
Non-publicly traded collateralized loan obligations in our fixed income securities portfolio  
Contractual Obligation 37.7
Non-publicly traded common stock within our equity portfolio  
Contractual Obligation 2.0
Commercial Mortgage Loans SIGI  
Contractual Obligation $ 4.4