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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
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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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