Intangible Assets, Other Assets, Net and Goodwill (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Additions to Other Assets, Amount	$ 4.7
Amortization of deferred financing costs to interest expense	1.9	1.6	1.3
Write off of Deferred Debt Issuance Cost	$ 0.5