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Commitments And Contingencies (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
Anticipated expenditures relating to completion of construction type contracts	$ 137.4		$ 137.4
Rental expense	0.6	0.7	1.3	1.4
Minimum annual rental commitments, remainder 2012	1.3		1.3
Minimum annual rental commitments, 2013	2.5		2.5
Minimum annual rental commitments, 2014	2.4		2.4
Minimum annual rental commitments, 2015	1.5		1.5
Minimum annual rental commitments, 2016	0.4		0.4
Minimum annual rental commitments, thereafter	$ 0.9		$ 0.9
Maximum [Member] | Partnership Interest [Member]
Less than joint venture economic interest noted	100.00%		100.00%

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