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Investments - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Other Receivables $ 214,000,000.0   $ 219,700,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,438,800,000    
Debt securities, available-for-sale, continuous unrealized loss position, less than twelve months, securities that have had recognized credit losses in earnings, aggregate losses     300,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, securities that have had recognized credit losses in earnings, aggregate losses     0
Fixed maturities, allowance for credit losses 4,800,000 $ 5,400,000 0
Equity securities 788,200,000   907,300,000
Equity securities, FV-NI, unrealized gain (loss) 76,700,000    
Equity securities without readily determinable fair value, impairment loss, annual amount 2,000,000.0    
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount 500,000    
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount 0    
Equity securities without readily determinable fair value, impairment loss, cumulative amount 5,000,000.0    
Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings 206,200,000   220,400,000
Outstanding commitments to fund equity method limited liability investments 96,500,000    
Investments in Fixed Maturities      
Debt Securities, Available-for-sale [Line Items]      
Other Receivables 3,500,000   1,000,000.0
Other liabilities 29,800,000   19,500,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss 55,200,000   20,800,000
12 Months or Longer 26,300,000   13,300,000
Government National Mortgage Association Certificates and Obligations (GNMA)      
Debt Securities, Available-for-sale [Line Items]      
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 469,700,000    
Federal National Mortgage Association Certificates and Obligations (FNMA)      
Debt Securities, Available-for-sale [Line Items]      
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 5,700,000    
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)      
Debt Securities, Available-for-sale [Line Items]      
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 12,500,000    
Other Non-Governmental Issuers      
Debt Securities, Available-for-sale [Line Items]      
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 950,900,000    
Equity Securities      
Debt Securities, Available-for-sale [Line Items]      
Other Receivables 0   0
Other liabilities 0   0
Investment-grade | Investments in Fixed Maturities      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available-for-sale, unrealized loss position, accumulated loss 19,200,000   9,100,000
Non-investment-grade | Investments in Fixed Maturities      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ 36,000,000.0   $ 11,700,000
Percentage of unrealized loss position to amortized cost basis of available for sale security average 11.00%   5.00%