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Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Financial liabilities:
Financial liabilities fair value	$ 197.4	$ 150.6
Sanofi-Aventis Deutschland GmbH
Financial liabilities:
Financial liabilities fair value	62.0	36.8
Warrant Liability
Financial liabilities:
Financial liabilities fair value	18.1
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	15.6	14.4
Senior Convertible Notes | Convertible Debt Securities
Financial liabilities:
Financial liabilities fair value	21.8	21.3
Facility financing obligation
Financial liabilities:
Financial liabilities fair value	79.9	78.4
Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	197.4	150.6
Fair Value, Inputs, Level 3 | Sanofi-Aventis Deutschland GmbH
Financial liabilities:
Financial liabilities fair value	62.0	36.5
Fair Value, Inputs, Level 3 | Warrant Liability
Financial liabilities:
Financial liabilities fair value	18.1
Fair Value, Inputs, Level 3 | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	15.6	14.4
Fair Value, Inputs, Level 3 | Senior Convertible Notes | Convertible Debt Securities
Financial liabilities:
Financial liabilities fair value	21.8	21.3
Fair Value, Inputs, Level 3 | Facility financing obligation
Financial liabilities:
Financial liabilities fair value	$ 79.9	$ 78.4

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- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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