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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Alternative Investments [Member]
Mar. 31, 2013
Alternative Investments [Member]
Dec. 31, 2013
Investments accounted for under the equity method [Member]
Dec. 31, 2012
Investments accounted for under the equity method [Member]
Schedule of Equity Method Investments [Line Items]            
Net Investment Income         $ 65,100,000 $ 204,800,000
Realized gains         63,300,000 593,400,000
Net change in unrealized appreciation (depreciation)         505,900,000 (417,500,000)
Net income         634,300,000 380,700,000
Net investment income earned $ 35,534,000 $ 32,870,000 $ 5,200,000 $ 3,600,000