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Investments in Unconsolidated Affiliates (Symetra Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Nov. 05, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 01, 2016
Dec. 31, 2011
Investments in unconsolidated affiliates                    
Trading Securities, Change in Unrealized Holding Gain (Loss)           $ (267,300,000) $ 152,900,000 $ (79,300,000)    
Trading Securities Unrealized Holding Gain (Loss) on Investments after Tax           (226,600,000) 140,600,000 (69,400,000)    
Realized gains           315,500,000 112,900,000 194,000,000    
After tax amortization through equity in net unrealized losses           0 (36,300,000) 75,300,000    
Sales of common equity securities           $ 1,200,800,000 $ 461,400,000 609,800,000    
Common shares, par value per share (in dollars per share)   $ 1.00       $ 1.00 $ 1.00      
Symetra                    
Investments in unconsolidated affiliates                    
Payments to Acquire Interest in Subsidiaries and Affiliates               195,000,000    
Trading Securities, Change in Unrealized Holding Gain (Loss)   $ 258,800,000                
Trading Securities Unrealized Holding Gain (Loss) on Investments after Tax   $ 241,100,000                
Realized gains $ 4,700,000                  
Shares of symetra financial corporation owned (in shares)         20,562,379          
Ownership interest (as a percent)         17.70%          
Fair value of investment                   $ 261,000,000
Estimated fair value of investment per share                   $ 15
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity         $ 159,900,000          
Term of amortization (in years)     30 years              
Dividends Payable, Amount Per Share                 $ 32.00  
Common Stock | Symetra                    
Investments in unconsolidated affiliates                    
Dividends received         $ (16,900,000)          
Per share price, class of warrant (in dollars per share)         $ 31.67          
equity in earnings of unconsolidated affiliates [Member] | Symetra                    
Investments in unconsolidated affiliates                    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity         $ 32,600,000          
After tax amortization through equity in earnings       $ 2,200,000       2,800,000    
Net unrealized gains (losses) of unconsolidated affiliates [Member] | Symetra                    
Investments in unconsolidated affiliates                    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity         $ 127,300,000          
After tax amortization through equity in net unrealized losses       $ 8,900,000       $ 11,700,000    
Symetra                    
Investments in unconsolidated affiliates                    
Sales of common equity securities $ 658,000,000