Fair Value Measurement (Qualitative Information About Liabilities Measured at Fair Value on Recurring Basis Using Level 3 Inputs) (Details) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Joint venture net written option	$ 22.5	$ 11.5
Recurring Basis \| Contingent Consideration Payable \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Liabilities	$ 616.2
Minimum \| Recurring Basis \| Contingent Consideration Payable \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Periods in which milestones are expected to be achieved	2018
Forecast quarterly royalties payable on net sales of relevant products	$ 0.1
Maximum \| Recurring Basis \| Contingent Consideration Payable \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Periods in which milestones are expected to be achieved	2040
Forecast quarterly royalties payable on net sales of relevant products	$ 16.0
Fair value \| Recurring Basis
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Liabilities	695.0	1,222.4
Joint venture net written option	$ 48.0	$ 40.0
Cumulative probability of milestones being achieved \| Minimum \| Recurring Basis \| Contingent Consideration Payable \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Contingent consideration, measurement input	0.105
Cumulative probability of milestones being achieved \| Maximum \| Recurring Basis \| Contingent Consideration Payable \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Contingent consideration, measurement input	0.90
Discount for lack of marketability, liabilities \| Minimum \| Recurring Basis \| Contingent Consideration Payable \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Contingent consideration, measurement input	0.032
Discount for lack of marketability, liabilities \| Maximum \| Recurring Basis \| Contingent Consideration Payable \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Contingent consideration, measurement input	0.092
Cash flow scenario probability weighting \| Recurring Basis \| Derivative Financial Instruments, Liabilities \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative liability, measurement input	1.00
Assumed market participant discount rate \| Recurring Basis \| Derivative Financial Instruments, Liabilities \| Income approach
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative liability, measurement input	0.14

Estimated quarterly royalties payable on net sales of relevant products, used as an input to measure fair value.

No definition available.

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- Definition

Periods in which milestones are expected to be achieved, used as an input to measure fair value.

+ References

No definition available.

+ Details

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- Definition

Value of input used to measure contingent consideration liability from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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- Definition

Value of input used to measure derivative liability.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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