Non-Controlling Interests in The Parent Company (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Non-Controlling Interests in the Parent Company (Textuals) [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 122.4	$ 128.3
Settlement value of non controlling interest in operating partnership	$ 78.6	$ 115.4