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Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financial liabilities:
Financial liabilities fair value	$ 156.6	$ 93.5
Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	17.8	19.1
Carrying Value
Financial liabilities:
Financial liabilities fair value	149.2	86.0
Carrying Value | Milestone Rights Liability
Financial liabilities:
Financial liabilities fair value	8.9	8.9
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	156.6	93.5
Estimate of Fair Value Measurement | Milestone Rights Liability | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	17.8	19.1
5.75% Senior convertible notes due October 23, 2021
Financial liabilities:
Financial liabilities fair value	19.9	19.8
5.75% Senior convertible notes due October 23, 2021 | Carrying Value
Financial liabilities:
Financial liabilities fair value	24.4	24.4
5.75% Senior convertible notes due October 23, 2021 | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	19.9	19.8
Facility Financing Obligation
Financial liabilities:
Financial liabilities fair value	50.1	54.6
Facility Financing Obligation | Carrying Value
Financial liabilities:
Financial liabilities fair value	43.7	52.7
Facility Financing Obligation | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	50.1	$ 54.6
Note Payable to Related Party
Financial liabilities:
Financial liabilities fair value	68.8
Note Payable to Related Party | Carrying Value
Financial liabilities:
Financial liabilities fair value	72.2
Note Payable to Related Party | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Financial liabilities:
Financial liabilities fair value	$ 68.8

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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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