Financing Activities - Distributions (Details) - $ / shares	1 Months Ended	3 Months Ended	9 Months Ended
Aug. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Distributions (Numeric) [Abstract]
Dividend payable date of quarterly common stock dividend	Oct. 01, 2018
Current quarterly common stock dividend (in dollars per share)	$ 41.0	$ 0.41	$ 0.395	$ 1.23	$ 1.185
Annualized current quarterly common stock dividend (in dollars per share)	$ 1.64

The per annum equivalent of the increased quarterly stock dividend the last time the dividend was changed.

No definition available.

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- References

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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