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Condensed Financial Information of The Registrant (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 19, 2013
Dec. 31, 2012
Jun. 30, 2006
Assets                                  
Fixed maturity securities available-for-sale                       $ 29,642,905,000 $ 25,480,972,000        
Short-term investments                       558,284,000 97,694,000        
Cash and cash equivalents $ 1,525,275,000     $ 1,645,669,000 $ 1,645,669,000     $ 923,647,000 $ 1,645,669,000 $ 923,647,000 $ 1,259,892,000 1,525,275,000 1,645,669,000 $ 923,647,000   $ 1,259,892,000  
Other assets                       712,366,000 602,957,000        
Total assets                       50,383,152,000 44,654,300,000 [1]        
Liabilities and Stockholders’ Equity                                  
Other liabilities                       1,165,071,000 994,230,000        
Total stockholders equity                       6,135,381,000 7,023,452,000 5,935,527,000   6,910,187,000  
Total liabilities and stockholders’ equity                       50,383,152,000 44,654,300,000        
CONSOLIDATED STATEMENTS OF INCOME                                  
Total investment related gains (losses), net                 (164,750,000) 186,193,000 63,990,000            
Income Tax Expense (Benefit)                 242,629,000 324,486,000 216,417,000            
Net Income (Loss) Attributable to Parent 163,127,000 $ 83,534,000 $ 130,391,000 125,114,000 191,091,000 $ 157,996,000 $ 198,296,000 136,664,000 502,166,000 684,047,000 418,837,000            
Other Comprehensive Income (Loss), Net of Tax                 (948,845,000) 651,522,000 (1,103,295,000)            
Total comprehensive income (loss)                 (446,679,000) 1,335,569,000 (684,458,000)            
Debt Disclosure [Abstract]                                  
Debt Instrument, Face Amount                                 $ 850,000,000.0
Debt Issuance Cost                   25,300,000              
Cash flows from operating activities                                  
Net Income (Loss) Attributable to Parent 163,127,000 $ 83,534,000 $ 130,391,000 125,114,000 191,091,000 $ 157,996,000 $ 198,296,000 136,664,000 502,166,000 684,047,000 418,837,000            
Other, net                 (18,461,000) 155,428,000 99,634,000            
Net cash provided by operating activities                 2,088,615,000 2,336,155,000 1,727,160,000            
Cash flows from investing activities                                  
Sales of fixed maturity securities available-for-sale                 5,461,687,000 4,309,985,000 3,629,378,000            
Purchases of fixed maturity securities available-for-sale                 21,322,000 63,785,000 33,724,000            
Payments to Acquire Businesses, Net of Cash Acquired                 (145,235,000) 0 (2,805,000)            
Payments for (Proceeds from) Short-term Investments                 (470,002,000) 38,060,000 138,024,000            
Payments for (Proceeds from) Other Investing Activities                 77,445,000 286,665,000 (209,900,000)            
Net cash used in investing activities                 (1,431,741,000) (1,310,945,000) (1,335,101,000)            
Cash flows from financing activities                                  
Dividends to stockholders                 (93,381,000) (87,256,000) (77,642,000)            
Purchases of treasury stock                 (384,519,000) (201,525,000) (269,204,000)            
Excess tax benefits from share-based payment arrangement cash flow                 2,963,000 (3,011,000) 3,125,000            
Exercise of stock options, net                 11,151,000 9,246,000 28,390,000            
Proceeds from affiliated long-term debt issuance                 0 (100,000,000) (398,492,000)            
Payments Of Debt Issuance Costs                 (4,748,000) (4,260,000) (3,400,000)            
Net cash used in financing activities                 (708,282,000) (255,559,000) (681,213,000)            
Change in cash and cash equivalents                 (120,394,000) 722,022,000 (336,245,000)            
Cash and cash equivalents, beginning of period       1,645,669,000       923,647,000 1,645,669,000 923,647,000 1,259,892,000            
Cash and cash equivalents, end of period 1,525,275,000       1,645,669,000       1,525,275,000 1,645,669,000 923,647,000            
Supplementary information:                                  
Interest paid                 148,124,000 136,499,000 116,809,000            
Income taxes paid, net of refunds                 41,577,000 70,342,000 110,773,000            
Parent Company [Member]                                  
Assets                                  
Fixed maturity securities available-for-sale                       426,218,000 486,813,000        
Short-term investments                       254,398,000 87,726,000        
Cash and cash equivalents 39,452,000     48,819,000 48,819,000     24,137,000 48,819,000 24,137,000 52,680,000 39,452,000 48,819,000 $ 24,137,000   $ 52,680,000  
Investments In Subsidiary                       8,110,687,000 8,649,084,000        
Loans and Leases Receivable, Related Parties                       1,070,000,000 1,060,000,000        
Other assets                       309,340,000 342,487,000        
Total assets                       10,210,095,000 10,674,929,000        
Liabilities and Stockholders’ Equity                                  
Short-term and long-term debt - unaffiliated [2]                       2,279,663,000 2,277,421,000        
Long-term debt - affiliated [3]                       500,000,000 500,000,000        
Other liabilities                       1,295,051,000 874,056,000        
Total stockholders equity                       6,135,381,000 7,023,452,000        
Total liabilities and stockholders’ equity                       10,210,095,000 10,674,929,000        
CONSOLIDATED STATEMENTS OF INCOME                                  
Interest and Dividend Income, Operating [4]                 321,645,000 521,623,000 275,215,000            
Total investment related gains (losses), net                 (324,000) 4,936,000 1,714,000            
Operating Expenses                 (13,652,000) (10,751,000) (21,164,000)            
Interest and Debt Expense                 (176,364,000) (131,852,000) (162,212,000)            
Income (loss) before income tax and undistributed earnings of subsidiaries                 131,305,000 383,956,000 93,553,000            
Income Tax Expense (Benefit)                 (19,465,000) (22,008,000) 33,850,000            
Net income (loss) before undistributed earnings of subsidiaries                 150,770,000 405,964,000 59,703,000            
Equity In Undistributed Earnings Of Subsidiaries                 351,396,000 278,083,000 359,134,000            
Net Income (Loss) Attributable to Parent                 502,166,000 684,047,000 418,837,000            
Other Comprehensive Income (Loss), Net of Tax                 44,073,000 36,876,000 21,033,000            
Total comprehensive income (loss)                 546,239,000 720,923,000 439,870,000            
Debt Disclosure [Abstract]                                  
Proceeds from Dividends Received                 196,445,000 423,323,000 175,000,000            
Long-term Debt                       500,000,000 500,000,000        
Notes and Loans, Noncurrent                       2,295,709,000 2,294,993,000        
Debt Issuance Cost                 (16,046,000) (17,572,000)              
Cash flows from operating activities                                  
Net Income (Loss) Attributable to Parent                 502,166,000 684,047,000 418,837,000            
Equity Net Earnings Subsidiaries                 (351,396,000) (278,083,000) (359,134,000)            
Other, net                 486,159,000 (171,299,000) 162,586,000            
Net cash provided by operating activities                 636,929,000 234,665,000 222,289,000            
Cash flows from investing activities                                  
Sales of fixed maturity securities available-for-sale                 100,734,000 132,732,000 176,062,000            
Purchases of fixed maturity securities available-for-sale                 (52,698,000) (105,535,000) (103,566,000)            
Purchases Of Subsidiary Debt Securities                 (10,000,000) 41,751,000 (76,751,000)            
Payments to Acquire Businesses, Net of Cash Acquired                 (3,701,000) 0 (2,805,000)            
Payments for (Proceeds from) Short-term Investments                 (102,508,000) 96,967,000 (96,967,000)            
Payments for (Proceeds from) Other Investing Activities                 (7,542,000) 126,397,000 (79,023,000)            
Capital Contributions To Subsidiaries                 (103,832,000) (222,760,000) (144,459,000)            
Net cash used in investing activities                 (179,547,000) 69,552,000 (327,509,000)            
Cash flows from financing activities                                  
Dividends to stockholders                 (93,381,000) (87,256,000) (77,642,000)            
Purchases of treasury stock                 (384,519,000) (201,525,000) (269,204,000)            
Exercise of stock options, net                 11,151,000 9,246,000 28,390,000            
Proceeds from affiliated long-term debt issuance                 0 0 (398,533,000)            
Payments Of Debt Issuance Costs                 0 0 (3,400,000)            
Net cash used in financing activities                 (466,749,000) (279,535,000) 76,677,000            
Change in cash and cash equivalents                 (9,367,000) 24,682,000 (28,543,000)            
Cash and cash equivalents, beginning of period       $ 48,819,000       $ 24,137,000 48,819,000 24,137,000 52,680,000            
Cash and cash equivalents, end of period $ 39,452,000       $ 48,819,000       39,452,000 48,819,000 24,137,000            
Supplementary information:                                  
Interest paid                 165,775,000 161,499,000 141,615,000            
Income taxes paid, net of refunds                 (120,680,000) $ 87,000 $ 82,000,000            
Junior Subordinated Debentures Due 2065 [Member]                                  
Debt Disclosure [Abstract]                                  
Debt Instrument, Face Amount                       400,000,000          
Junior Subordinated Debentures Due 2065 [Member] | Parent Company [Member]                                  
Liabilities and Stockholders’ Equity                                  
Short-term and long-term debt - unaffiliated                       398,663,000 398,660,000        
Subordinated Debentures Due 2042 [Member]                                  
Debt Disclosure [Abstract]                                  
Debt Instrument, Face Amount                       $ 400,000,000          
Debt Instrument, Interest Rate, Stated Percentage                       6.20%          
Subordinated Debentures Due 2042 [Member] | Parent Company [Member]                                  
Liabilities and Stockholders’ Equity                                  
Short-term and long-term debt - unaffiliated                       $ 400,000,000 400,000,000        
Senior Notes Due 2023 [Member]                                  
Debt Disclosure [Abstract]                                  
Debt Instrument, Face Amount                       $ 400,000,000     $ 400,000,000.0    
Debt Instrument, Interest Rate, Stated Percentage                       4.70%     4.70%    
Senior Notes Due 2023 [Member] | Parent Company [Member]                                  
Liabilities and Stockholders’ Equity                                  
Short-term and long-term debt - unaffiliated                       $ 398,835,000 398,684,000        
Senior Notes Due 2021 [Member]                                  
Debt Disclosure [Abstract]                                  
Debt Instrument, Face Amount                       $ 400,000,000          
Debt Instrument, Interest Rate, Stated Percentage                       5.00%          
Senior Notes Due 2021 [Member] | Parent Company [Member]                                  
Liabilities and Stockholders’ Equity                                  
Short-term and long-term debt - unaffiliated                       $ 398,803,000 398,583,000        
Senior Notes Due 2019 [Member]                                  
Debt Disclosure [Abstract]                                  
Debt Instrument, Face Amount                       $ 400,000,000          
Debt Instrument, Interest Rate, Stated Percentage                       6.45%          
Senior Notes Due 2019 [Member] | Parent Company [Member]                                  
Liabilities and Stockholders’ Equity                                  
Short-term and long-term debt - unaffiliated                       $ 399,737,000 399,669,000        
Debt Disclosure [Abstract]                                  
Repayments of Long-term Debt                 400,000,000                
Senior Notes Due 2017 [Member]                                  
Debt Disclosure [Abstract]                                  
Debt Instrument, Face Amount                       $ 300,000,000          
Debt Instrument, Interest Rate, Stated Percentage                       5.625%          
Senior Notes Due 2017 [Member] | Parent Company [Member]                                  
Liabilities and Stockholders’ Equity                                  
Short-term and long-term debt - unaffiliated                       $ 299,671,000 $ 299,397,000        
Debt Disclosure [Abstract]                                  
Repayments of Long-term Debt                 $ 300,000,000                
[1] Total assets for the Corporate and Other segment have been updated to conform with current period presentation for the adoption of the accounting standard update "Simplifying the Presentation of Debt Issuance Costs."
[2] Long-term debt - unaffiliated consists of the following: 2015 2014$400 million Variable Rate Junior Subordinated Debentures due 2065 $398,663 $398,660$400 million 6.20% Subordinated Debentures due 2042 400,000 400,000$400 million 4.70% Senior Notes due 2023 398,835 398,684$400 million 5.00% Senior Notes due 2021 398,803 398,583$400 million 6.45% Senior Notes due 2019 399,737 399,669$300 million 5.625% Senior Notes due 2017 299,671 299,397Subtotal 2,295,709 2,294,993Unamortized debt issue costs (16,046) (17,572)Total $2,279,663 $2,277,421Repayments of long-term debt—unaffiliated due over the next five years total $300,000 in 2017 and $400,000 in
[3] Long-term debt—affiliated in 2015 and 2014 and consists of $500,000 of subordinated debt issued to various operating subsidia
[4] nterest/Dividend income includes $196,445, $423,323 and $175,000 of cash dividends received from consolidated subsidiaries in 2015, 2014 and 2013, respectively.