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Debt - Unsecured Revolving Credit Facility (Details) - Unsecured Revolving Credit Facility - Revolving Credit Facility	3 Months Ended
	Mar. 31, 2017 USD ($) option
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 1,100,000,000.0
Maximum borrowing capacity	$ 1,250,000,000.00
Option to extend maturity, number | option	2
Extension period	6 months
Extension fee percent of outstanding commitments under revolving credit facility	0.075%

X

- Definition

Debt Instrument, Option to Extend, Number

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Line of Credit Facility, Extension Fee, Percent of Outstanding Commitments Under Revolving Credit Facility

+ References

No definition available.

+ Details

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X

- Definition

Line of Credit Facility, Extension Period

+ References

No definition available.

+ Details

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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

X

- 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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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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