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Dividends - Additional Information (Details) - $ / shares |  | 3 Months Ended | 12 Months Ended
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Jan. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in shares) |  | $ 0.19125 | $ 0.19 | $ 0.18875 | $ 0.1875 | $ 0.18625 | $ 0.185 | $ 0.18375 | $ 0.1825 | $ 0.7575 | $ 0.7375 | $ 0.7175
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in shares) | $ 0.19125 |  |  |  |  |  |  |  |  |  |  |

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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 + Details
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