Investments in Affiliates (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
Summary of financial information by industry [Abstract]
Operating revenue	$ 5.7		$ 2.3		$ 7.3		$ 8.9
Operating income	(7.2)	[1]	(1.2)	[1]	(8.7)	[1]	1.7	[1]
Income (loss) from continuing operations	(7.8)	[1]	(1.8)	[1]	(9.7)	[1]	0.7	[1]
Net income (loss)	$ (7.8)	[1]	$ (1.8)	[1]	$ (9.7)	[1]	$ 0.7	[1]

[1] Includes a $6.5 million non-cash impairment write-down of entitled land (recognized at the joint venture level) owned by the Bakersfield joint venture.