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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

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- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ 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=35706170&loc=SL5580258-113959

Reference 2: 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=35706170&loc=SL5579245-113959

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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Fixed Rate Bonds (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014 Swap	Sep. 30, 2014 Swap	Dec. 31, 2013 Swap	Mar. 31, 2011 Swap	Sep. 30, 2013 Swap	Jun. 30, 2014 Swap
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Number of Interest Rate Derivatives Held	13	13	10
1.75% due 2014 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Derivative, Amount of Hedged Item				$ 450.0
Debt Instrument, Interest Rate, Stated Percentage				1.75%
Number of Interest Rate Derivatives Held				5
7.7% due 2015 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Derivative, Amount of Hedged Item					125.0
Debt Instrument, Interest Rate, Stated Percentage					7.70%
Number of Interest Rate Derivatives Held					1
5.5% due 2016 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Derivative, Amount of Hedged Item					800.0
Debt Instrument, Interest Rate, Stated Percentage					5.50%
Number of Interest Rate Derivatives Held					4
2.6% due 2017 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Derivative, Amount of Hedged Item						400.0
Debt Instrument, Interest Rate, Stated Percentage						2.60%
Number of Interest Rate Derivatives Held						4
1.4% due 2018 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Derivative, Amount of Hedged Item						300.0
Debt Instrument, Interest Rate, Stated Percentage						1.40%
Number of Interest Rate Derivatives Held						3
7.125% due 2017 \| Interest Rate Swaps
Derivative Instruments and Hedging Activities - Fixed Rate Bonds [Line Items]
Derivative, Amount of Hedged Item						$ 150.0
Debt Instrument, Interest Rate, Stated Percentage						7.125%
Number of Interest Rate Derivatives Held						1