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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ 34,292,000 $ 32,457,000 $ 106,600,000 $ 99,330,000
Alternative Investments [Member]
        
Schedule of Equity Method Investments [Line Items]        
Net investment income earned 3,900,000 [1] 2,600,000 [1] 12,700,000 [2] 10,100,000 [2]
Investments accounted for under the equity method [Member]
        
Schedule of Equity Method Investments [Line Items]        
Net Investment Income 81,300,000 [1] 97,800,000 [1] 167,000,000 [2] 352,800,000 [2]
Realized gains (26,100,000) [1] 162,800,000 [1] 171,500,000 [2] 762,500,000 [2]
Net change in unrealized appreciation (depreciation) 628,600,000 [1] 104,800,000 [1] 1,471,000,000 [2] 85,900,000 [2]
Net income $ 683,800,000 [1] $ 365,400,000 [1] $ 1,809,500,000 [2] $ 1,201,200,000 [2]
[1] The majority of these results are for the second quarter of each respective year.
[2] The majority of these results are for the nine months ended June 30 of each respective year.