Intangible Assets (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 ReportingUnits	Dec. 31, 2010	Dec. 31, 2009
Intangible Assets (Textual) [Abstract]
Number of reporting units to evaluate goodwill for impairment	2
Recognized amortization expenses	$ 13.8	$ 11.2	$ 9.9
Estimated amortization expense in 2012	9.7
Estimated amortization expense in 2013	9.4
Estimated amortization expense in 2014	8.4
Estimated amortization expense in 2015	7.1
Estimated amortization expense in 2016	6.6
Trademarks [Member]
Impaired Intangible Assets [Line Items]
Trademark impairment charges	$ 0	$ 0.6	$ 2.7