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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Dividends and Distributions - Additional Information (Details) - $ / shares					9 Months Ended
	Aug. 07, 2018	May 11, 2018	Feb. 27, 2018	Nov. 08, 2017	Sep. 30, 2018	Sep. 30, 2017
Class of Stock [Line Items]
Cash dividends declared per common share (in dollars per share)					$ 0.81	$ 0.78
Regular Quarterly Cash Dividend
Class of Stock [Line Items]
Cash dividends declared per common share (in dollars per share)	$ 0.27	$ 0.27	$ 0.27	$ 0.27
Cash dividends declared, period increase (in dollars per share)				$ 0.01
Second Quarter Two Thousand Eighteen
Class of Stock [Line Items]
Cash dividends, declared date					May 11, 2018
Cash dividends, record date					Jun. 29, 2018
Cash dividends, paid date					Jul. 13, 2018
Third Quarter Two Thousand Eighteen
Class of Stock [Line Items]
Cash dividends, declared date					Aug. 07, 2018
Cash dividends, record date					Sep. 28, 2018
Cash dividends, paid date					Oct. 15, 2018
First Quarter Two Thousand Eighteen
Class of Stock [Line Items]
Cash dividends, declared date					Feb. 27, 2018
Cash dividends, record date					Mar. 30, 2018
Cash dividends, paid date					Apr. 13, 2018
Fourth Quarter Two Thousand Seventeen
Class of Stock [Line Items]
Cash dividends, declared date					Nov. 08, 2017
Cash dividends, record date					Dec. 29, 2017
Cash dividends, paid date					Jan. 13, 2018

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