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Shareholders' Equity - Dividends (Details) - $ / shares | Jun. 15, 2018 | May 04, 2018 | Dec. 01, 2017 | Nov. 01, 2017 | Jun. 15, 2017 | May 02, 2017
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Equity [Abstract] |  |  |  |  |  |
Dividends declared (in dollars per share) |  | $ 1.01 |  | $ 0.93 |  | $ 0.93
Dividends paid (in dollars per share) | $ 1.01 |  | $ 0.93 |  | $ 0.93 |

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- Definition Aggregate dividends paid 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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- 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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