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Fair Value of Warrant Liability Carried at Fair Value (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial liabilities, beginning balance	$ 123.2
Fair values of financial liabilities, ending balance	103.0
Warrant Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair values of financial liabilities, beginning balance	7.4
Additions	0.0
Changes in fair value	(6.8)
Payments	0.0
Fair values of financial liabilities, ending balance	$ 0.6

X

- Definition

Gain Loss From Change In Fair Value Of Warrant Liabilities

+ References

No definition available.

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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.

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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.

+ References

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- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

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