Debt (Convertible Notes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2011 Convertible Notes Exchange Offer [Member]	Sep. 30, 2010 Convertible Notes Exchange Offer [Member]	Sep. 30, 2010 Convertible Notes [Member]
Principal amount of note			$ 20.0	$ 324.7	$ 345.0
Cash paid in exchange offer			3.1	52.0
Shares issued approximately			2.3	37.7
Fair market value of common stock at settlement			47.4
Fair value of the liability component of Convertible Notes Exchanged			21.8
Carrying value of Convertible Notes exchanged			17.3
Loss related to extinguishment of debt	$ 0	$ 4.8	$ (4.8)

Carrying value of convertible notes surrendered pursuant to the exchange offer.

No definition available.

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- Definition

Aggregate cash paid for the entire amount of convertible notes exchanged pursuant to an exchange offer carried out by the Company.

+ References

No definition available.

+ Details

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- Definition

Fair value of the liability component of convertible notes exchanged for the Company's common stock and cash.

+ References

No definition available.

+ Details

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- Definition

Value of shares issued and cash for the exchange of shares and cash for debt instruments which can be exchanged with the issuer by the holder for cash and common stock, at the option of the issuer.

+ References

No definition available.

+ Details

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- Definition

Shares issued for the exchange of shares and cash for debt instruments which can be exchanged with the issuer by the holder for cash and common stock, at the option of the issuer.

+ References

No definition available.

+ Details

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Definition

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 26

-Paragraph 20, 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: 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=6943989&loc=d3e3602-108585

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-Name Accounting Standards Codification

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-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

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