Fair Value Disclosures (Fair Value Of Certain Short And Long-term Debt, Based On Market Prices) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value Disclosures [Abstract]
Medium Term Notes at Fair Value	$ 1,679.7	$ 1,650.7
Medium-term notes at Book Value	1,632.3	1,623.0
Preferred securities underlying the junior convertible subordinated debentures at Fair Value	356.0	353.8
Preferred securities underlying the junior convertible subordinated debentures at Book Value	421.2	421.2
Convertible Debt, Fair Value Disclosures	0.1	45.5
Convertible notes	$ 0.1	$ 17.5

Fair value of medium-term notes based on quoted prices.

No definition available.

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- Definition

Fair value of preferred securities underlying the convertible subordinated debt.

+ References

No definition available.

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- Definition

Book value of preferred securities underlying the convertible subordinated debt.

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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-Topic 944

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a)(2))

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. Fair value of convertible debt at the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

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- Definition

Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

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-Publisher SEC

-Name Regulation S-X (SX)

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-Paragraph 16

-Article 9

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-Name Regulation S-X (SX)

-Number 210

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-Subparagraph (SX 210.5-02.22)

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