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Cash Dividends (Details) - $ / shares				3 Months Ended
	Dec. 06, 2016	Dec. 01, 2016	Sep. 08, 2016	Dec. 31, 2016	Dec. 31, 2015
Cash Dividends
Cash dividends declared, per share (in dollars per share)	$ 0.70		$ 0.70	$ 0.7000	$ 0.6875
Cash dividend paid, per share (in dollars per share)		$ 0.70

X

- Definition

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

+ References

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

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

+ References

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

No definition available.

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