Long-Lived Assets (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Long-Lived Assets (Textual) [Abstract]
Total amortization expense related to intangible assets	$ 10.1	$ 10.3	$ 19.7	$ 19.7
Estimated total amortization expense 2012	38.4		38.4
Estimated total amortization expense 2013	28.1		28.1
Estimated total amortization expense 2014	20.5		20.5
Estimated total amortization expense 2015	12.9		12.9
Estimated total amortization expense 2016	$ 9.9		$ 9.9