Collaborative Arrangements (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Collaborative Arrangements [Abstract]
Total Assets Held by the Joint Venture	$ 1,700,000,000	$ 1,620,000,000
Cash and Cash Equivalents Held by Joint Venture	204,700,000	156,900,000
Accounts Receivable Held by Joint Venture	278,100,000	266,500,000
Inventories Held by Joint Venture	1,200,000,000	1,190,000,000
Total Liabilities Held by the Joint Venture	1,560,000,000	1,270,000,000
Acounts Payable Held by Joint Venture	611,700,000	561,100,000
Other Accrued Expenses Held by Joint Venture	$ 284,300,000	$ 232,900,000