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Non Controlling Interests in The Parent Company Non Contolling Interests in the Parent Company (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Non Controlling Interests In The Parent Company (Textuals) [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 33.1	$ 128.3
Settlement value of non controlling interest in operating partnership	$ 25.6	$ 115.4

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- Details

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- Definition

Settlement value of non controlling interest in operating partnership.

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No definition available.

+ Details

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- Definition

Carrying amount of the equity interests owned by noncontrolling partners in an operating partnership included in the entity's consolidated financial statements.

+ References

No definition available.

+ Details

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