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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

+ Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Fair Value (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended		9 Months Ended
	Sep. 30, 2014 Convertible Notes	Dec. 31, 2013 Convertible Notes	Sep. 30, 2009 Convertible Notes	Sep. 30, 2014 Senior Notes Original Notes [Member]	Mar. 12, 2013 Senior Notes Original Notes [Member]	Sep. 30, 2014 Senior Notes Senior Unsecured Notes due 2021	Jun. 09, 2014 Senior Notes Senior Unsecured Notes due 2021
Fair Value Disclosure [Line Items]
Market discount rate	6.00%			6.00%		5.875%
Convertible debt, fair value		$ 50.5
Interest rate, per year	4.00%		4.00%		6.00%		5.875%
Estimated fair value of senior unsecured notes				$ 350.0		$ 300.0