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Investments - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]      
Other Receivables $ 217,100,000   $ 245,400,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,189,600,000    
Debt securities, available-for-sale, continuous unrealized loss position, less than twelve months, securities that have had recognized credit losses in earnings, aggregate losses 200,000   0
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   0
Equity Securities at Fair Value 928,700,000   684,400,000
Equity securities, FV-NI, unrealized gain (loss) 98,300,000    
Equity securities without readily determinable fair value, impairment loss, annual amount 100,000    
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount 200,000    
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 213,400,000   187,000,000.0
Outstanding commitments to fund equity method limited liability investments 94,300,000    
Investments in Fixed Maturities      
Debt Securities, Available-for-sale [Line Items]      
Other liabilities 50,300,000   10,500,000
Other Receivables   $ 2,300,000 500,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss 21,600,000   86,600,000
12 Months or Longer 11,900,000   22,000,000.0
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 591,500,000    
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 7,500,000    
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 578,100,000    
Equity Securities      
Debt Securities, Available-for-sale [Line Items]      
Other liabilities 0   0
Other Receivables 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 6,500,000   69,500,000
Non-investment-grade | Investments in Fixed Maturities      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ 15,100,000   $ 17,100,000
Percentage of unrealized loss position to amortized cost basis of available for sale security average 6.00%   5.00%