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Invesments (Aggregated Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Mar. 31, 2010
Net investment income		$ 132,600,000		$ 125,600,000		$ 286,800,000		$ 274,400,000
Realized gains (losses)		355,300,000		(396,900,000)		163,000,000		(486,700,000)
Net change in unrealized appreciation		608,300,000		810,300,000		2,072,500,000		1,248,800,000
Net income		1,096,200,000		539,000,000		2,522,300,000		1,036,500,000
Net investment income earned	39,345,000		36,545,000		82,818,000		71,251,000
Alternative Investments [Member]
Net investment income earned	$ 7,900,000		$ 4,900,000		$ 19,500,000		$ 8,800,000

This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include net income or loss.

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