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Investments - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Equity Securities, FV-NI, Realized Gain (Loss) $ 1,600,000  
Other Receivables 189,200,000 $ 194,300,000
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 712,600,000  
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 706,600,000  
Other Liabilities 506,800,000 453,700,000
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses 200,000 0
Available For Sale Securities, Continuous Unrealized Loss Position, Credit Losses Recognized Related to Securities in An Unrealized Loss Position, In a Position of 12 Months or Longer $ 0 $ 0
Investments in Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months 1,806,700,000 482,900,000
Total $ 66,700,000 $ 19,500,000
12 Months or Longer 7,700,000 13,900,000
Other Receivables 0  
Other Liabilities 31,800,000 5,400,000
Less Than 12 Months 59,000,000 5,600,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 280,800,000 438,900,000
12 Months or Longer 7,700,000 13,900,000
Debt Securities, Available-for-sale, Unrealized Loss Position 2,087,500,000 921,800,000
Total $ 66,700,000 $ 19,500,000
U.S. Government and Government Agencies and Authorities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months 461,900,000 140,000,000
Less Than 12 Months $ 18,800,000 $ 1,100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 39,700,000 103,400,000
12 Months or Longer 1,100,000 5,100,000
Debt Securities, Available-for-sale, Unrealized Loss Position 501,600,000 243,400,000
Total 19,900,000 6,200,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Debt Securities, Available-for-sale [Line Items]    
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 458,800,000  
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]    
Debt Securities, Available-for-sale [Line Items]    
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 9,500,000  
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Debt Securities, Available-for-sale [Line Items]    
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 3,400,000  
Other Non-Governmental Issuers [Member]    
Debt Securities, Available-for-sale [Line Items]    
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 234,900,000  
Equity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Other Receivables 0 0
Other Liabilities 20,000,000 0
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
Total (57,600,000) 12,600,000
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
Total $ (9,100,000) $ 6,900,000
Percentage of Unrealized Loss Position to Amortized Cost Basis of Available for Sale Security Average 4.00% 4.00%