Fair Value Measurement (Qualitative Information About Liabilities Measured at Fair Value on Recurring Basis Using Level 3 Inputs) (Details) - Recurring Basis $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Contingent Consideration Payable | Income approach (probability weighted discounted cash flow)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liabilities	$ 1,051.2
Derivative Financial Instruments, Liabilities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assumed market participant discount rate	16.00%
Minimum | Contingent Consideration Payable
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Cumulative probability of milestones being achieved (in percent)	5.00%
Assumed market participant discount rate	1.80%
Periods in which milestones are expected to be achieved	2017
Forecast quarterly royalties payable on net sales of relevant products	$ 0.1
Minimum | Derivative Financial Instruments, Liabilities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Cash flow scenario probability weighting	0.00%
Maximum | Contingent Consideration Payable
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Cumulative probability of milestones being achieved (in percent)	90.00%
Assumed market participant discount rate	10.50%
Periods in which milestones are expected to be achieved	2040
Forecast quarterly royalties payable on net sales of relevant products	$ 7.5
Maximum | Derivative Financial Instruments, Liabilities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Cash flow scenario probability weighting	65.00%
Fair value
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Joint venture net written option	$ 25.0