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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 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Alternative Investments [Member]
Jun. 30, 2013
Alternative Investments [Member]
Jun. 30, 2014
Alternative Investments [Member]
Jun. 30, 2013
Alternative Investments [Member]
Mar. 31, 2014
Investments accounted for under the equity method [Member]
Mar. 31, 2013
Investments accounted for under the equity method [Member]
Mar. 31, 2014
Investments accounted for under the equity method [Member]
Mar. 31, 2013
Investments accounted for under the equity method [Member]
Schedule of Equity Method Investments [Line Items]                        
Net Investment Income                 $ 22,800,000 $ 46,800,000 $ 85,700,000 $ 255,000,000
Realized gains                 74,200,000 (22,100,000) 197,600,000 599,700,000
Net change in unrealized appreciation (depreciation)                 207,600,000 378,800,000 842,400,000 (18,900,000)
Net income                 304,600,000 403,500,000 1,125,700,000 835,800,000
Net investment income earned $ 36,774,000 $ 34,003,000 $ 72,308,000 $ 66,873,000 $ 3,600,000 $ 3,900,000 $ 8,800,000 $ 7,500,000