Number of warrants associated with the convertible notes that were repurchased during the period.

No definition available.

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- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle) and amount due to the Entity from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such investments and receivables to an amount that approximates their net realizable value.

+ References

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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph b

-Article 5

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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Mar. 31, 2015
3.75% Convertible Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrants repurchased	0.1	7.2
Forecast [Member] \| 3.75% Convertible Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Common stock warrants repurchased			4.7
Bonds A Series [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivables, carrying value	87.0	87.0
Bonds B Series [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivables, carrying value	62.6	62.6
Notes receivable, fair value	44	44