Summary of Significant Accounting Policies (Principles of Consolidation/ Depreciation and Amortization) (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Dec. 31, 2006
Buildings and improvements, useful life, minimum	5
Buildings and improvements, useful life, maximum	55
PJP VII [Member]
Payment guarantees other than the guarantee	$ 0.7
Restatement Adjustment [Member]
Depreciation and amortization expense relating to intangibles	4.7	1.7	(1.4)	(1.8)	(1.7)	(1.5)
Depreciation expense related to projects completed in prior years		$ (1.2)	$ 0.9	$ 0.2