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Investments - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Other Receivables $ 207,800,000 $ 219,700,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,343,300,000  
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 4,600,000 0
Equity Securities at Fair Value (Cost: 2020 - $698.0; 2019 - $818.8) 709,800,000 907,300,000
Equity securities, FV-NI, unrealized gain (loss) (112,800,000)  
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 226,300,000 220,400,000
Outstanding commitments to fund equity method limited liability investments 89,500,000  
Investments in Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
Other Receivables 7,700,000 1,000,000.0
Other liabilities 76,200,000 19,500,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss 179,900,000 20,800,000
12 Months or Longer 47,600,000 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 561,400,000  
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 6,800,000  
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 13,300,000  
Other Non-Governmental Issuers    
Debt Securities, Available-for-sale [Line Items]    
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 761,800,000  
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 110,700,000 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 $ 69,200,000 $ 11,700,000
Percentage of unrealized loss position to amortized cost basis of available for sale security average 17.00% 5.00%