Fair Value Measurement (Quantitative Information About Recurring and Non-recurring Level 3 Fair Value Measurements) (Details) (Recurring Basis, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Contingent Consideration Payable | Minimum
Fair Value Inputs
Assumed market participant discount rate	2.30%
Cumulative probability of milestones being achieved	18.00%
Periods in which milestones are expected to be achieved	2013
Forecast quarterly royalties payable on net sales of relevant products	$ 1.7
Contingent Consideration Payable | Maximum
Fair Value Inputs
Assumed market participant discount rate	8.70%
Cumulative probability of milestones being achieved	57.00%
Periods in which milestones are expected to be achieved	2028
Forecast quarterly royalties payable on net sales of relevant products	7.6
Contingent Consideration Payable | Income approach (probability weighted discounted cash flow)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Liabilities	366.2
Contingent Consideration Receivable
Fair Value Inputs
Assumed market participant discount rate	5.70%
Contingent Consideration Receivable | Minimum
Fair Value Inputs
Probability weightings applied to different sales scenarios	10.00%
Future forecast royalties receivable at relevant contractual royalty rates	14
Contingent Consideration Receivable | Maximum
Fair Value Inputs
Probability weightings applied to different sales scenarios	35.00%
Future forecast royalties receivable at relevant contractual royalty rates	176
Contingent Consideration Receivable | Income approach (probability weighted discounted cash flow)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets	$ 37.7