Non Controlling Interests in The Parent Company (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 17.5	$ 20.3
Settlement value of non controlling interest in operating partnership	$ 24.5	$ 24.8

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

No definition available.

Name:	us-gaap_MinorityInterestInOperatingPartnerships
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant