Impairment of Real Estate and Investment in Joint Venture (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Impairment of Real Estate and Investment in Joint Venture [Abstract]
Non-cash impairments and equity losses			$ 9.8
Impairment of real estate assets (Santa Barbara)	5.1	0	5.1	0
Impairment and equity losses related to Bakersfield joint venture	4.7		4.7
Number of impaired real estate investments			2
Number of real estate investments			3
Remaining book value of impaired real estate investments	12.9		12.9
Book value of real estate project in Palmdale, California	$ 4.7		$ 4.7

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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