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Equity Offering (Details) (USD $) Share data in Millions, except Per Share data	0 Months Ended		6 Months Ended
	Jul. 08, 2011	Jun. 08, 2011	Jun. 30, 2011
Equity Offering
Number of shares sold	0.7	48.0	48.0
Common stock, public offering price		$ 27.00
Proceeds from the sale of common stock		$ 1,250,000	$ 1,249,407,000
Proceeds from shares issued for underwriters' over-allotments	$ 18,400,000

The cash inflow associated with the amount received from entity's first offering of stock to the public.

The cash inflow from the additional capital contribution to the entity.

Number of new stock issued during the period.