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Income Taxes Income Taxes-Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 uncertain_tax_position	Dec. 31, 2011 Indemnity	Dec. 31, 2010 Indemnity	Dec. 31, 2011 Exchange	Dec. 31, 2010 Exchange
Income taxes
Taxable loss on sale of limited partnerships				$ 38		$ 175
Tax refunds received due to the sale of limited partnership			13		61
Number of uncertain income tax positions		1
Charge for tax and associated interest expense	$ 0.9

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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