Debt (Junior Convertible Subordinated Debentures) (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended
Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Junior Subordinated Debt [Member]
Finance subsidiary ownership percentage			100.00%
Issued shares of convertible preferred securities			10.0
Interest rate of convertible preferred securities			5.25%
Preferred securities convertible into common stock			0.9865
Preferred securities issued unconditionally guarantees			8.4
Percentage of liquidation preference payable when called			100.00%
Liquidation preference on preferred stock			$ 421.2
Maturity date of junior convertible subordinated debentures			Dec. 01, 2027
Outstanding debentures	$ 436.7	$ 436.7	$ 436.7

Number of shares of redeemable convertible preferred securities issued initially.

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- Definition

Number of shares of redeemable convertible preferred securities outstanding.

+ Details

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- Definition

The ratio applied to the convertible preferred stock for purposes of determining the number of shares of the equity security into which the convertible preferred stock will be converted.

+ Details

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- Definition

Liquidation Preference On Preferred Stock

+ Details

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- Definition

Percentage of liquidiation preference of convertible preferred stock payable when called by the issuer.

+ Details

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- Definition

The Company's ownership percentage of its unconsolidated subsidiary.

+ Details

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- Definition

Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Article 5
-Subsection 20, 22

+ Details

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- Definition

Interest rate stated in the contractual 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

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

+ 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 Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

+ Details

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