Condensed Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares				3 Months Ended
Mar. 06, 2019	Dec. 14, 2018	Sep. 05, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Consolidated Statement of Shareholders' Equity
Dividends declared (in dollars per share)	$ 0.71	$ 0.71	$ 0.71	$ 0.71	$ 0.71	$ 0.70	$ 0.70

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

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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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration