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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Dividends and Distributions - Additional Information (Details) - $ / shares						3 Months Ended								12 Months Ended
	Nov. 13, 2018	Aug. 07, 2018	May 11, 2018	Feb. 27, 2018	Nov. 08, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Cash dividends declared per common share (in dollars per share)						$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.26	$ 0.26	$ 0.26	$ 1.09	$ 1.05	$ 1.16
Regular Quarterly Cash Dividend
Class of Stock [Line Items]
Cash dividends declared, period increase (in dollars per share)	$ 0.01				$ 0.01
Cash dividends declared per common share (in dollars per share)	$ 0.28	$ 0.27	$ 0.27	$ 0.27	$ 0.27
Fourth Quarter Two Thousand Eighteen
Class of Stock [Line Items]
Cash dividends, declared date														Nov. 13, 2018
Cash dividends, record date														Dec. 31, 2018
Cash dividends, paid date														Jan. 15, 2019
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
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
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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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