Related Party Transactions (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended		7 Months Ended	12 Months Ended	52 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jul. 01, 2009	Dec. 31, 2012	Mar. 31, 2013
Related Party Transactions [Abstract]
Liquidity Units Owned (in Shares)			4.7
Payments To Acquire Limited Partnership Interest					$ 1,200,000,000
Percentage Of Trigger Point On Outstanding Accumulation Units							45.00%
Redemption Of Liquidity Units	$ 325,400,000	$ 306,100,000	$ 325,400,000	$ 306,100,000		$ 940,300,000