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Segment Information (Financial Information With Respect to Business Segments Related to Identifiable Assets) (Details) (USD $) In Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Total	$ 8,981.3	$ 8,569.9
Identifiable Assets [Member]
Property and Casualty	8,852.9	8,436.3
Discontinued operations	128.4	133.6
Total	$ 8,981.3	$ 8,569.9

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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