Intangible Assets and Goodwill (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011
Summary of roll forward of the changes in goodwill
Goodwill, Beginning balance	$ 1,138,600,000	$ 1,146,314,000
Goodwill acquired during the year	25,600,000
Other	(17,900,000)
Goodwill, Ending balance	$ 1,146,314,000	$ 1,146,314,000