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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 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
Alternative Investments [Member]
Jun. 30, 2012
Alternative Investments [Member]
Jun. 30, 2013
Alternative Investments [Member]
Jun. 30, 2012
Alternative Investments [Member]
Jun. 30, 2013
Investments accounted for under the equity method [Member]
Jun. 30, 2012
Investments accounted for under the equity method [Member]
Jun. 30, 2013
Investments accounted for under the equity method [Member]
Jun. 30, 2012
Investments accounted for under the equity method [Member]
Schedule of Equity Method Investments [Line Items]                        
Net investment income                 $ 97,800,000 $ 80,000,000 $ 352,800,000 $ 170,100,000
Realized (losses) gains                 162,800,000 19,600,000 762,500,000 1,004,900,000
Net change in unrealized depreciation                 104,800,000 (117,100,000) 85,900,000 (551,100,000)
Net income                 365,400,000 (17,500,000) 1,201,200,000 623,900,000
Net investment income earned $ 32,457,000 $ 30,650,000 $ 99,330,000 $ 97,284,000 $ 2,600,000 $ 500,000 $ 10,100,000 $ 5,500,000