Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified				9 Months Ended
Dec. 31, 2010	Sep. 30, 2011 Interest Rate Swap [Member]	Dec. 31, 2010 Interest Rate Swap [Member]	Sep. 30, 2011 Rate of return swap [Member]
Derivative Financial Instruments (Textuals) [Abstract]
Notional amount of interest rate swaps		$ 52.3	$ 52.3
Interest rate swaps fair value		6.6	2.7
Weighted Average Term of Interest Rate Swaps		9.4 years
Estimated unrealized losses on interest rate swaps that will be reclassified into earnings during the next twelve months		1.6
Weighted average fixed rate related to the interest rate swaps		3.43%		6.30%
Borrowings subject to total rate of return swaps	276.9			144.3
Reduced amount of debt subject to total rate of return swaps				$ 132.0
Weighted average variable pay rate under total rate of return swaps				1.80%

Borrowings subject to total rate of return swaps.

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- Definition

Derivative financial instruments.

+ Details

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ Details

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- Definition

The average time remaining until maturity on the group of derivatives identified.

+ Details

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- Definition

Average variable interest rate related to the group of interest rate derivatives.

+ Details

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- Definition

Gross amount of debt extinguished.

+ Details

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-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 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

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- Definition

Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

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