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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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Stated rate on an interest rate forward or futures contract.

+ References

No definition available.

+ Details

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

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

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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Namespace Prefix:
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Derivative Financial Instruments Narrative (Details) - Cash Flow Hedging [Member] $ in Millions	Dec. 31, 2018 interest_rate_swap_agreement	Jun. 24, 2018 USD ($) interest_rate_swap_agreement	Mar. 27, 2016 USD ($) interest_rate_swap_agreement
Forward-Starting Interest Rate Swap [Member]
Derivative [Line Items]
Number of derivative instruments	0
Interest Rate Swap at 4.63% [Member]
Derivative [Line Items]
Number of derivative instruments		4
Derivative, Notional Amount \| $		$ 500.0
Derivative, forward interest rate		4.63%
2013 forwards [Member] \| Forward-Starting Interest Rate Swap [Member]
Derivative [Line Items]
Number of derivative instruments			4
Derivative, Notional Amount \| $			$ 500.0
Average rate			4.39%