Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Definition

Derivative weighted average variable interest rate on hedge item.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- 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.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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- Details

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- Details

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- Details

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Derivatives (Details) - USD ($)	9 Months Ended
Derivatives (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Aggregate notional amount of interest rate swaps	$ 825,000,000	$ 600,000,000
Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member] \| Interest rate swaps maturing June 2017 [Member]
Debt Instrument [Line Items]
Issuance date	May 24, 2011
Maturity date	Jun. 01, 2017
Face value of medium-term notes	$ 350,000,000
Aggregate notional amount of interest rate swaps	$ 150,000,000
Fixed interest rate	3.50%
Weighted-average variable interest rate on hedged debt	1.52%		1.42%
Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member] \| Interest rate swaps maturing November 2018 [Member]
Debt Instrument [Line Items]
Issuance date	Nov. 12, 2013
Maturity date	Nov. 15, 2018
Face value of medium-term notes	$ 300,000,000
Aggregate notional amount of interest rate swaps	$ 100,000,000
Fixed interest rate	2.45%
Weighted-average variable interest rate on hedged debt	1.28%		1.18%
Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member] \| Interest rate swaps maturing June 2019 [Member]
Debt Instrument [Line Items]
Issuance date	Feb. 25, 2014
Maturity date	Jun. 01, 2019
Face value of medium-term notes	$ 350,000,000
Aggregate notional amount of interest rate swaps	$ 100,000,000
Fixed interest rate	2.55%
Weighted-average variable interest rate on hedged debt	1.19%		1.10%
Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member] \| Interest rate swaps maturing September 2019 [Member]
Debt Instrument [Line Items]
Issuance date	May 06, 2014
Maturity date	Sep. 03, 2019
Face value of medium-term notes	$ 400,000,000
Aggregate notional amount of interest rate swaps	$ 100,000,000
Fixed interest rate	2.45%
Weighted-average variable interest rate on hedged debt	0.95%		0.86%
Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member] \| Interest rate swaps maturing March 2020 [Member]
Debt Instrument [Line Items]
Issuance date	Feb. 24, 2015
Maturity date	Mar. 02, 2020
Face value of medium-term notes	$ 400,000,000
Aggregate notional amount of interest rate swaps	$ 150,000,000
Fixed interest rate	2.65%
Weighted-average variable interest rate on hedged debt	1.21%		0.00%
Designated as Hedging Instrument [Member] \| Fair Value Hedging [Member] \| Interest Rate Swaps Maturing September 2020 [Member]
Debt Instrument [Line Items]
Issuance date	Aug. 24, 2015
Maturity date	Sep. 01, 2020
Face value of medium-term notes	$ 300,000,000
Aggregate notional amount of interest rate swaps	$ 225,000,000
Fixed interest rate	2.875%
Weighted-average variable interest rate on hedged debt	1.52%		0.00%