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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Schedule of Equity Method Investments [Line Items]                
Net investment income   $ 54,000,000   $ 132,600,000   $ 90,100,000   $ 286,800,000
Realized gains (losses)   234,600,000   355,300,000   985,300,000   163,000,000
Net change in unrealized (depreciation) appreciation   53,400,000   608,300,000   (434,000,000)   2,072,500,000
Net income   342,000,000   1,096,200,000   641,400,000   2,522,300,000
Net investment income earned 34,006,000   39,345,000   66,634,000   82,818,000  
Alternative Investments [Member]
                
Schedule of Equity Method Investments [Line Items]                
Net investment income earned   $ 3,000,000   $ 7,900,000   $ 5,000,000   $ 19,500,000