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Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Milestone Payments [Member]
Long-term Purchase Commitment Line Items]
Long-term Purchase Commitment, Amount	$ 235.4
Milestone Payments [Member]
Long-term Purchase Commitment Line Items]
Minimum purchase commitments	5.3
Number Of Months	12
Research and Development Expense [Member]
Long-term Purchase Commitment Line Items]
Minimum purchase commitments	4.0
Inventories [Member]
Long-term Purchase Commitment Line Items]
Minimum purchase commitments	$ 145.2

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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