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Shareholders' Equity Cash Dividends Declared Per Common Share (Details) - $ / shares | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Equity [Abstract] |  |
Cash dividends declared and paid per common share (in dollars per share) | $ 0.55 | $ 0.53

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration