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Quarterly Financial Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 31, 2012
Quarterly Financial Data [Abstract]                        
Total revenues $ 2,723,102,000 $ 2,449,081,000 $ 2,375,753,000 $ 2,292,975,000 $ 2,348,219,000 $ 1,994,907,000 $ 2,203,977,000 $ 2,282,435,000 $ 9,840,911,000 $ 8,829,538,000 $ 8,261,730,000  
Total benefits and expenses 2,402,013,000 2,247,602,000 2,159,861,000 2,112,212,000 2,154,968,000 1,838,511,000 2,016,808,000 2,055,680,000 8,921,688,000 8,065,967,000 7,455,549,000  
Income Loss From Continuing Operations Before Provision For Income Tax 321,089,000 201,479,000 215,892,000 180,763,000 193,251,000 156,396,000 187,169,000 226,755,000 919,223,000 763,571,000 806,181,000  
Net income $ 222,989,000 $ 144,475,000 $ 141,111,000 $ 123,318,000 $ 138,579,000 $ 134,602,000 $ 123,944,000 $ 148,920,000 $ 631,893,000 $ 546,045,000 $ 535,742,000  
Basic earnings per share:                        
Earnings Per Share, Basic $ 3.02 $ 1.96 $ 1.91 $ 1.68 $ 1.89 $ 1.82 $ 1.68 $ 2.03 $ 8.57 $ 7.42 $ 7.32  
Earnings Per Share, Diluted $ 3.00 $ 1.95 $ 1.91 $ 1.67 $ 1.88 $ 1.81 $ 1.66 $ 2.02 $ 8.52 $ 7.37 $ 7.17  
Dividends declared per share $ 0.24 $ 0.24 $ 0.18 $ 0.18 $ 0.18 $ 0.18 $ 0.12 $ 0.12 $ 0.84 $ 0.60 $ 0.48  
Common Stock Value [Abstract]                        
Common Stock Price Per Share $ 53.52 $ 57.87 $ 53.21 $ 59.47 $ 52.25 $ 45.95 $ 60.86 $ 62.78 $ 53.52 $ 52.25    
Common Stock Value High $ 60.20 $ 60.69 $ 59.87 $ 59.97 $ 55.51 $ 64.32 $ 63.73 $ 63.14 $ 60.20 $ 55.51    
Common Stock Value Low $ 48.36 $ 52.75 $ 48.80 $ 51.19 $ 44.67 $ 44.51 $ 58.40 $ 53.92 $ 48.36 $ 44.67    
Common stock shares outstanding 73,927,331 73,852,000 73,722,000 73,712,000 73,363,195 73,267,000 74,076,000 73,797,000 73,927,331 73,363,195    
Common Stockholders Of Record                       76,603