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Investments (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment [Line Items]      
Commercial mortgage loans, Percentage 100.00% 100.00%  
Trading Securities, Change in Unrealized Holding Gain (Loss) $ 600,000 $ (3,400,000) $ (700,000)
Equity Method Investments 0    
Commercial mortgage loans, transferred to affiliates 631,000,000    
Accumulated Other Comprehensive Income Loss Unrealized Gains And Losses On Other Than Temporarily Impaired Securities Net Of Tax 8,000,000 9,000,000  
Non Income Producing Assets, Fixed Maturities 600,000    
Gross unrealized losses related to high or highest quality securities 93,300,000 133,600,000  
Gross unrealized losses related to other than high or highest quality securities 9,200,000 19,200,000  
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 74,800,000 40,300,000  
Securities Sold under Agreements to Repurchase 68,904,000 0  
Securities Continuous Unrealized Loss Position Declines In Value Of Greater Than 20 Percent Aggregate Losses 0 0  
Securities Sold under Agreements to Repurchase      
Investment [Line Items]      
Fair Value of Securities Received as Collateral that Can be Resold or Repledged 58,400,000 156,000,000  
Maturity Overnight      
Investment [Line Items]      
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred   38,000,000  
Maturity Less than 30 Days      
Investment [Line Items]      
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred   2,300,000  
Corporate securities      
Investment [Line Items]      
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 68,000,000 33,300,000  
Foreign government bonds      
Investment [Line Items]      
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred $ 6,800,000 7,000,000  
California      
Investment [Line Items]      
Commercial mortgage loans, Percentage 23.00%    
Texas      
Investment [Line Items]      
Commercial mortgage loans, Percentage 15.00%    
Illinois      
Investment [Line Items]      
Commercial mortgage loans, Percentage 7.00%    
Fixed maturities, available-for-sale      
Investment [Line Items]      
Assets Deposited With Governmental Authorities $ 3,200,000 3,900,000  
Short-term investments and cash equivalents      
Investment [Line Items]      
Assets Deposited With Governmental Authorities 600,000    
Fixed maturities, available-for-sale:      
Investment [Line Items]      
Other Noncash Income (Expense) (1,500,000) 400,000 (5,800,000)
Equity securities, available-for-sale:      
Investment [Line Items]      
Other Noncash Income (Expense) $ 0 $ 0 $ 0